{"id":645,"sequence":"GDAGAPGAPGSQGAPGLQGMPGER","proforma":"[Oxidation]^4?GDAGAPGAPGSQGAPGLQGMPGER","modifications":[{"name":"Oxidation","count":4,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":2197.9658229537004,"mh":2198.9731,"url":"https://msipep.com/peptide/645/"}