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[Oxidation]^3?GSPGEAGRPGEAGLPGAK

Sequence: GSPGEAGRPGEAGLPGAK (18 residues)
Modifications: 3× Oxidation (P) Unimod:35
Monoisotopic mass: 1654.79108 Da
Calculated ions: [M+H]+ 1655.7984 · [M+Na]+ 1677.7803 · [M+K]+ 1693.7542 · [M+2H]2+ 828.4028

Position in protein

Collagen alpha-1(I) chain residues 521–538 of 1464

Protein	Measured m/z	Calc. m/z	ppm	Species · tissue	Source	Status
Collagen alpha-1(I) chain UniProt P02452	1655.7800	1655.7984	-11.1	Homo sapiens (human) · Pancreas · Pancreatic tumour	10.1007/s00216-010-3554-6	Approved Reported theoretical m/z differs from the calculated value