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A. Total ion current from an ESI-MS analysis of intact hIgG1 Fc, a homodimer containing two N-glycans. B. Total ion current from MALDI-MS of permethylated hIgG1 Fc F243S N-glycans. C. Total ion current from an ESI-MS analysis of procainamide-derivatized N-glycans from recombinant CD16a.
