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        {
            "accession": "UNIMOD:985",
            "name": "cysTMT6plex",
            "definition": "Cysteine-reactive Sixplex Tandem Mass Tag®.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(25) C(10) 13C(4) N(2) 15N O(2) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "jorogers6"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "304.3962"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "C"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "record_id",
                    "description": "985"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "304.177202"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-04-22 22:05:46"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2024-08-12 10:07:35"
                }
            ]
        },
        {
            "accession": "UNIMOD:986",
            "name": "Label:13C(6)+Dimethyl",
            "definition": "Dimethyl 13C(6) Silac label.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(-4) 13C(6)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "glick2"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "34.0091"
                },
                {
                    "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": "spec_1_misc_notes",
                    "description": "SILAC+PTM"
                },
                {
                    "id": "record_id",
                    "description": "986"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "34.051429"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-05-09 10:48:19"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2010-05-14 16:19:43"
                }
            ]
        },
        {
            "accession": "UNIMOD:987",
            "name": "Label:13C(6)15N(2)+Dimethyl",
            "definition": "Dimethyl 13C(6)15N(2) Silac label.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(-4) 13C(6) N(-2) 15N(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "glick2"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "35.9959"
                },
                {
                    "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": "spec_1_misc_notes",
                    "description": "SILAC+PTM"
                },
                {
                    "id": "record_id",
                    "description": "987"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "36.045499"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-05-09 10:57:55"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2010-05-14 16:20:12"
                }
            ]
        },
        {
            "accession": "UNIMOD:989",
            "name": "Ammonium",
            "definition": "Replacement of proton with ammonium ion.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(3) N"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "BThomas"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "17.0305"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "C-term"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Artefact"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "17.026549"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_2_site",
                    "description": "E"
                },
                {
                    "id": "record_id",
                    "description": "989"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any C-term"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-05-18 10:32:03"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2010-06-04 15:08:34"
                }
            ]
        },
        {
            "accession": "UNIMOD:991",
            "name": "ISD_z+2_ion",
            "definition": "ISD (z+2)-series.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-1) N(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "suckau"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-15.0146"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "N-term"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "spec_1_misc_notes",
                    "description": "this is a virtual modification, as it only accounts for the structure of the MS/MS fragment as it occurs in Top-Down MS/MS analyses. This must be accounted for in MS³-analysis of z+2 ions"
                },
                {
                    "id": "record_id",
                    "description": "991"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any N-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-15.010899"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-06-08 09:42:52"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2024-08-12 11:27:50"
                }
            ]
        },
        {
            "accession": "UNIMOD:993",
            "name": "Biotin:Sigma-B1267",
            "definition": "Was Biotin-maleimide.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(27) C(20) N(5) O(5) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "mpcusack"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "449.5239"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "C"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "993"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "449.17329"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-06-10 07:50:00"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2010-12-03 16:02:22"
                }
            ]
        },
        {
            "accession": "UNIMOD:994",
            "name": "Label:15N(1)",
            "definition": "15N(1).",
            "additional_data": [
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "spec_9_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_5_group",
                    "description": "5"
                },
                {
                    "id": "spec_9_site",
                    "description": "C"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_2_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_3_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "0.997035"
                },
                {
                    "id": "spec_6_site",
                    "description": "P"
                },
                {
                    "id": "spec_14_group",
                    "description": "14"
                },
                {
                    "id": "spec_2_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_9_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_2_site",
                    "description": "Y"
                },
                {
                    "id": "spec_10_site",
                    "description": "I"
                },
                {
                    "id": "spec_5_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_14_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_7_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_3_site",
                    "description": "G"
                },
                {
                    "id": "date_time_posted",
                    "description": "2010-06-22 14:52:08"
                },
                {
                    "id": "spec_3_group",
                    "description": "3"
                },
                {
                    "id": "spec_9_group",
                    "description": "9"
                },
                {
                    "id": "spec_7_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_3_hidden",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "ppicotti"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "0.9934"
                },
                {
                    "id": "spec_14_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_4_site",
                    "description": "A"
                },
                {
                    "id": "spec_11_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_7_site",
                    "description": "V"
                },
                {
                    "id": "spec_11_group",
                    "description": "11"
                },
                {
                    "id": "spec_10_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_8_site",
                    "description": "T"
                },
                {
                    "id": "record_id",
                    "description": "994"
                },
                {
                    "id": "spec_7_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_8_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_13_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_11_position",
                    "description": "Anywhere"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-11-21 14:26:07"
                },
                {
                    "id": "spec_12_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_4_position",
                    "description": "Anywhere"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_site",
                    "description": "F"
                },
                {
                    "id": "spec_2_group",
                    "description": "2"
                },
                {
                    "id": "spec_10_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_12_group",
                    "description": "12"
                },
                {
                    "id": "spec_11_site",
                    "description": "L"
                },
                {
                    "id": "spec_9_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_7_group",
                    "description": "7"
                },
                {
                    "id": "spec_14_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_3_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_5_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_6_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_4_group",
                    "description": "4"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "delta_composition",
                    "description": "N(-1) 15N"
                },
                {
                    "id": "spec_11_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_12_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_8_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_8_group",
                    "description": "8"
                },
                {
                    "id": "spec_13_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_13_site",
                    "description": "E"
                },
                {
                    "id": "spec_14_site",
                    "description": "M"
                },
                {
                    "id": "spec_5_site",
                    "description": "S"
                },
                {
                    "id": "spec_13_group",
                    "description": "13"
                },
                {
                    "id": "spec_8_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_10_group",
                    "description": "10"
                },
                {
                    "id": "spec_12_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_5_position",
                    "description": "Anywhere"
                },
                {
                    "id": "spec_10_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_6_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_4_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_6_group",
                    "description": "6"
                },
                {
                    "id": "spec_12_site",
                    "description": "D"
                },
                {
                    "id": "spec_13_classification",
                    "description": "Isotopic label"
                },
                {
                    "id": "spec_6_classification",
                    "description": "Isotopic label"
                }
            ]
        }
    ]
}