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a) Full mass spectrum of SLRRSSCFGGR after reaction with NQ. b) Full mass spectrum of Hemoglobin modified with NQ. Alpha chain (#) modified by one NQ. Beta chain single (*) and double (**) NQ modifications. c) Beta Lactoglobulin after NQ modification. Two natural variants A and B (both containing five cysteines and two disulfide bonds) are observed each with a single NQ modification. d) NQ modification of lysozyme after partial reduction of all four disulfide bonds.
