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MALDI-MS spectra obtained from a 0.5-μl aliquot of rinsed beads after digestion of affinity-bound SOS gp140 with LysC for 2.5 h, followed by digestion with carboxypeptidase Y for 1 min (average mass; panel A) and 5 min (exact mass; panel B). The ion indicated by the asterisk is a background ion.
