{"id":644,"sequence":"GAPGDRGEPGPPGPAGFAGPPGADGQPGAK","proforma":"[Oxidation]^4?GAPGDRGEPGPPGPAGFAGPPGADGQPGAK","modifications":[{"name":"Oxidation","count":4,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":2702.2320847337,"mh":2703.23936,"url":"https://msipep.com/peptide/644/"}