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            "definition": "Arg->Ser substitution.",
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            ]
        },
        {
            "accession": "UNIMOD:642",
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            "definition": "Arg->Gln substitution.",
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                {
                    "id": "delta_composition",
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        },
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            "definition": "Arg->Met substitution.",
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                    "id": "delta_composition",
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        },
        {
            "accession": "UNIMOD:644",
            "name": "Arg->Cys",
            "definition": "Arg->Cys substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-7) C(-3) N(-3) S"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-53.0428"
                },
                {
                    "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": "644"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-53.091927"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:47:00"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 11:47:00"
                }
            ]
        },
        {
            "accession": "UNIMOD:645",
            "name": "Arg->Xle",
            "definition": "Arg->Leu/Ile substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-1) N(-3)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-43.028"
                },
                {
                    "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": "645"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-43.017047"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:47:36"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2011-06-21 15:09:05"
                }
            ]
        },
        {
            "accession": "UNIMOD:646",
            "name": "Arg->Gly",
            "definition": "Arg->Gly substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(-9) C(-4) N(-3)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-99.1344"
                },
                {
                    "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": "646"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-99.079647"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 11:48:00"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 11:48:00"
                }
            ]
        },
        {
            "accession": "UNIMOD:647",
            "name": "Ser->Phe",
            "definition": "Ser->Phe substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "H(4) C(6) O(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "60.0966"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "S"
                },
                {
                    "id": "spec_1_classification",
                    "description": "AA substitution"
                },
                {
                    "id": "record_id",
                    "description": "647"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "60.036386"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 12:32:55"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 12:32:55"
                }
            ]
        },
        {
            "accession": "UNIMOD:648",
            "name": "Ser->Ala",
            "definition": "Ser->Ala substitution.",
            "additional_data": [
                {
                    "id": "delta_composition",
                    "description": "O(-1)"
                },
                {
                    "id": "spec_1_group",
                    "description": "1"
                },
                {
                    "id": "username_of_poster",
                    "description": "unimod"
                },
                {
                    "id": "delta_avge_mass",
                    "description": "-15.9994"
                },
                {
                    "id": "group_of_poster",
                    "description": ""
                },
                {
                    "id": "spec_1_hidden",
                    "description": "1"
                },
                {
                    "id": "spec_1_site",
                    "description": "S"
                },
                {
                    "id": "spec_1_classification",
                    "description": "AA substitution"
                },
                {
                    "id": "record_id",
                    "description": "648"
                },
                {
                    "id": "spec_1_position",
                    "description": "Anywhere"
                },
                {
                    "id": "delta_mono_mass",
                    "description": "-15.994915"
                },
                {
                    "id": "date_time_posted",
                    "description": "2006-11-09 12:33:14"
                },
                {
                    "id": "approved",
                    "description": "0"
                },
                {
                    "id": "date_time_modified",
                    "description": "2006-11-09 12:33:14"
                }
            ]
        }
    ]
}