{"id":1140,"sequence":"GPPGAAGAPGPQGFQGPAGEPGEPGQTGPAGAR","proforma":"[Oxidation]^4?GPPGAAGAPGPQGFQGPAGEPGEPGQTGPAGAR","modifications":[{"name":"Oxidation","count":4,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":2958.3492397437003,"mh":2959.35652,"url":"https://msipep.com/peptide/1140/"}