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The N-glycan sialylation analysis of EPO-Fc protein. (a,c) The overall Neu5Ac and Neu5Gc content with four N-sites summed up together. (b,d) The site-specific Neu5Gc and Neu5Ac content. Neu5Gc, N-glycolylneuraminic acid; Neu5Ac, N-acetylneuraminic acid
