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a) Full mass spectrum of Alpha Lactalbumin (ALA) following modification with NQ. Peaks are labeled with the charge state and the number of NQ modifications. b) Photodissociation of the +11 charge state of ALA with a single NQ modification. Cβ-S bond cleavage is labeled (C-S). Two backbone fragments are observed, z4 and d6, at the N and C terminal cysteines. c) Photodissociation of the +12 charge state of ALA with two NQ modifications.
