{"id":679,"sequence":"GPSGPQGPGGPPGPK","proforma":"[Oxidation]?GPSGPQGPGGPPGPK","modifications":[{"name":"Oxidation","count":1,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":1301.6364136637,"mh":1302.64369,"url":"https://www.msipep.com/peptide/679/"}