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                    "id": "spec_2_neutral_loss_1956_composition",
                    "description": "dHex(2) Hex(4) HexNAc(5)"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-05-05 12:00:00"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "delta_composition",
                    "description": "dHex(2) Hex(4) HexNAc(5)"
                },
                {
                    "id": "spec_1_neutral_loss_0_avge_mass",
                    "description": "0"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "1956.8074"
                },
                {
                    "id": "spec_1_neutral_loss_0_mono_mass",
                    "description": "0"
                },
                {
                    "id": "spec_1_neutral_loss_1956_composition",
                    "description": "dHex(2) Hex(4) HexNAc(5)"
                },
                {
                    "id": "spec_1_neutral_loss_0_flag",
                    "description": "false"
                },
                {
                    "id": "spec_1_neutral_loss_1956_mono_mass",
                    "description": "1955.723975"
                },
                {
                    "id": "spec_2_neutral_loss_0_mono_mass",
                    "description": "0"
                },
                {
                    "id": "spec_2_neutral_loss_0_flag",
                    "description": "false"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_neutral_loss_0_composition",
                    "description": "0"
                },
                {
                    "id": "record_id",
                    "description": "1785"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_neutral_loss_0_avge_mass",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2015-05-05 12:00:00"
                }
            ]
        },
        {
            "accession": "UNIMOD:1786",
            "name": "Hex(1)HexNAc(1)NeuAc(1)Ac(1)",
            "definition": "Ac Hex HexNAc NeuAc.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "Ac Hex HexNAc NeuAc"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_1_neutral_loss_0_avge_mass",
                    "description": "0"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "698.6244"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "T"
                },
                {
                    "id": "spec_1_classification",
                    "description": "O-linked glycosylation"
                },
                {
                    "id": "spec_1_neutral_loss_0_mono_mass",
                    "description": "0"
                },
                {
                    "id": "spec_1_neutral_loss_0_flag",
                    "description": "false"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "698.238177"
                },
                {
                    "id": "spec_1_neutral_loss_699_avge_mass",
                    "description": "698.6244"
                },
                {
                    "id": "spec_1_neutral_loss_699_mono_mass",
                    "description": "698.238177"
                },
                {
                    "id": "spec_1_neutral_loss_699_flag",
                    "description": "false"
                },
                {
                    "id": "spec_1_neutral_loss_699_composition",
                    "description": "Ac Hex HexNAc NeuAc"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "record_id",
                    "description": "1786"
                },
                {
                    "id": "spec_1_neutral_loss_0_composition",
                    "description": "0"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-05-05 16:37:35"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2015-05-06 09:37:44"
                }
            ]
        },
        {
            "accession": "UNIMOD:1787",
            "name": "Label:13C(2)15N(2)",
            "definition": "13C(2) 15N(2).",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "C(-2) 13C(2) N(-2) 15N(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "rbomgard"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "3.9721"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "record_id",
                    "description": "1787"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "4.00078"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-05-15 22:30:48"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2015-05-24 18:09:48"
                }
            ]
        },
        {
            "accession": "UNIMOD:1789",
            "name": "Xlink:DSS[155]",
            "definition": "Ammonium-quenched monolink of DSS/BS3 crosslinker.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(13) C(8) N O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "johant"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "155.1943"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Protein N-term"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "155.094629"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "N-term"
                },
                {
                    "id": "record_id",
                    "description": "1789"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-06-17 14:35:50"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2017-08-17 15:09:42"
                }
            ]
        },
        {
            "accession": "UNIMOD:1799",
            "name": "NQIGG",
            "definition": "SUMOylation by Giardia lamblia.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(31) C(19) N(7) O(7)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "brunog"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "469.4921"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Post-translational"
                },
                {
                    "id": "record_id",
                    "description": "1799"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "469.228496"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-10-02 16:16:32"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2015-11-01 16:20:37"
                }
            ]
        },
        {
            "accession": "UNIMOD:1800",
            "name": "Carboxyethylpyrrole",
            "definition": "Carboxyethylpyrrole.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(6) C(7) O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "jsc17"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "122.1213"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "1800"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "122.036779"
                },
                {
                    "id": "date_time_posted",
                    "description": "2015-11-19 01:35:22"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-04-06 08:03:01"
                }
            ]
        },
        {
            "accession": "UNIMOD:1801",
            "name": "Fluorescein-tyramine",
            "definition": "Fluorescein-tyramine adduct by peroxidase activity.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(19) C(29) N O(7)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "Hideaki"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "493.4637"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "Y"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "1801"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "493.116152"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-02-02 11:23:24"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-04-06 08:08:06"
                }
            ]
        },
        {
            "accession": "UNIMOD:1824",
            "name": "GEE",
            "definition": "Transamidation of glycine ethyl ester to glutamine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(6) C(4) O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "michaelmerchant"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "86.0892"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "Q"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_1_misc_notes",
                    "description": "GEE (glycine ethyl ester) is a substrate for the enzyme Factor XIII for cross-linking to fibrinogen"
                },
                {
                    "id": "record_id",
                    "description": "1824"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "86.036779"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-05-12 15:56:17"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-05-18 17:11:04"
                }
            ]
        },
        {
            "accession": "UNIMOD:1825",
            "name": "RNPXL",
            "definition": "Simulate peptide-RNA conjugates.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(13) C(9) N(2) O(9) P"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "324.1813"
                },
                {
                    "id": "spec_1_neutral_loss_325_composition",
                    "description": "H(13) C(9) N(2) O(9) P"
                },
                {
                    "id": "spec_2_neutral_loss_325_flag",
                    "description": "false"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Any N-term"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Other"
                },
                {
                    "id": "spec_1_neutral_loss_325_flag",
                    "description": "false"
                },
                {
                    "id": "spec_2_neutral_loss_325_avge_mass",
                    "description": "324.1813"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "324.035867"
                },
                {
                    "id": "spec_1_neutral_loss_325_avge_mass",
                    "description": "324.1813"
                },
                {
                    "id": "spec_2_neutral_loss_325_composition",
                    "description": "H(13) C(9) N(2) O(9) P"
                },
                {
                    "id": "spec_1_neutral_loss_325_mono_mass",
                    "description": "324.035867"
                },
                {
                    "id": "spec_2_neutral_loss_325_mono_mass",
                    "description": "324.035867"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "R"
                },
                {
                    "id": "record_id",
                    "description": "1825"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any N-term"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-06-05 14:23:58"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-07-01 11:23:46"
                }
            ]
        },
        {
            "accession": "UNIMOD:1826",
            "name": "Glu->pyro-Glu+Methyl",
            "definition": "Pyro-Glu from E + Methylation.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "C O(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-3.9887"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "E"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "record_id",
                    "description": "1826"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-3.994915"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-06-15 10:07:50"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-06-15 10:07:50"
                }
            ]
        },
        {
            "accession": "UNIMOD:1827",
            "name": "Glu->pyro-Glu+Methyl:2H(2)13C(1)",
            "definition": "Pyro-Glu from E + Methylation Medium.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-2) 2H(2) 13C O(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-0.9837"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "E"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "record_id",
                    "description": "1827"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-0.979006"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-06-15 10:30:37"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-06-15 10:30:37"
                }
            ]
        },
        {
            "accession": "UNIMOD:1828",
            "name": "LRGG+methyl",
            "definition": "LeumethylArgGlyGly.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(31) C(17) N(7) O(4)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "bkatja"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "397.4725"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Post-translational"
                },
                {
                    "id": "record_id",
                    "description": "1828"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "397.243753"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-07-27 14:34:54"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-09-23 13:43:32"
                }
            ]
        },
        {
            "accession": "UNIMOD:1829",
            "name": "LRGG+dimethyl",
            "definition": "LeudimethylArgGlyGly.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(33) C(18) N(7) O(4)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "bkatja"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "411.4991"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "K"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Post-translational"
                },
                {
                    "id": "record_id",
                    "description": "1829"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "411.259403"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-07-27 16:20:40"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2016-09-23 13:43:57"
                }
            ]
        },
        {
            "accession": "UNIMOD:1830",
            "name": "Biotin-tyramide",
            "definition": "Biotin-Phenol.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(23) C(18) N(3) O(3) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_2_misc_notes",
                    "description": "Only observed on a small fraction of residues (~2%). See doi: 10.1038/nmeth.4465"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "361.4585"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "Y"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "spec_3_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "361.146012"
                },
                {
                    "id": "spec_3_misc_notes",
                    "description": "Only observed on a small fraction of residues (~2%). See doi: 10.1038/nmeth.4465"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "C"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "1830"
                },
                {
                    "id": "spec_3_site",
                    "description": "W"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_posted",
                    "description": "2016-08-04 08:05:43"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2023-02-24 12:26:35"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                }
            ]
        }
    ]
}