{"id":673,"sequence":"GPNGEAGSAGPPGPPGLR","proforma":"[Oxidation]^2?GPNGEAGSAGPPGPPGLR","modifications":[{"name":"Oxidation","count":2,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":1618.7699470237,"mh":1619.77722,"url":"https://msipep.com/peptide/673/"}