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Tandem mass spectrum of residues 53-72 (APGVYVGTAPSGCIGGLGAR) of BFSP2 (phakinin). DHA is formed from hydrogen sulfide loss from cysteine with a mass shift of -33.9877 Da. b-ions are labeled in blue, y-ions yellow, and a-ions are red. Letters in black refer to residues not identified by b, y, and a ions.
