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                    "id": "date_time_modified",
                    "description": "2006-10-16 17:10:59"
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            "accession": "UNIMOD:646",
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                    "id": "delta_composition",
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        },
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                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:45:56"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 11:45:56"
                }
            ]
        },
        {
            "accession": "UNIMOD:1287",
            "name": "Arg-loss",
            "definition": "Loss of arginine due to transpeptidation.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-12) C(-6) N(-4) O(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-156.1857"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Other"
                },
                {
                    "id": "record_id",
                    "description": "1287"
                },
                {
                    "id": "spec_1_position",
                    "description": "Any C-term"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-156.101111"
                },
                {
                    "id": "date_time_posted",
                    "description": "2011-11-21 10:12:18"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-11-24 16:39:25"
                }
            ]
        },
        {
            "accession": "UNIMOD:640",
            "name": "Arg->Lys",
            "definition": "Arg->Lys substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "N(-2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-28.0134"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_classification",
                    "description": "AA substitution"
                },
                {
                    "id": "record_id",
                    "description": "640"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-28.006148"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:45:37"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 11:45:37"
                }
            ]
        },
        {
            "accession": "UNIMOD:643",
            "name": "Arg->Met",
            "definition": "Arg->Met substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-3) C(-1) N(-3) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-24.9896"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_classification",
                    "description": "AA substitution"
                },
                {
                    "id": "record_id",
                    "description": "643"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-25.060626"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:46:37"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 11:46:37"
                }
            ]
        },
        {
            "accession": "UNIMOD:837",
            "name": "Arg->Npo",
            "definition": "Arginine replacement by Nitropyrimidyl ornithine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-1) C(3) N O(2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "Kramerh"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "81.0297"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Chemical derivative"
                },
                {
                    "id": "record_id",
                    "description": "837"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "80.985078"
                },
                {
                    "id": "date_time_posted",
                    "description": "2008-04-10 15:35:22"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2008-04-21 18:30:45"
                }
            ]
        },
        {
            "accession": "UNIMOD:372",
            "name": "Arg->Orn",
            "definition": "Ornithine from Arginine.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-2) C(-1) N(-2)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-42.04"
                },
                {
                    "id": "group_of_poster",
                    "description": "admin"
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "R"
                },
                {
                    "id": "spec_1_classification",
                    "description": "Artefact"
                },
                {
                    "id": "record_id",
                    "description": "372"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-42.021798"
                },
                {
                    "id": "date_time_posted",
                    "description": "2005-10-05 17:55:25"
                },
                {
                    "id": "approved",
                    "description": "1"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-10-13 15:26:33"
                }
            ]
        }
    ]
}