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. 2015 Mar 2;112(11):E1297–E1306. doi: 10.1073/pnas.1422481112

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Fig. 2. — Application of sialylation process to IVIg alters Fc glycosylation of all IgG isotypes and Fab glycans to generate IgG Fc bearing primarily four sialic acid residues. IVIg is shown in red, and s4-IVIg is shown in blue. (A) Deconvoluted mass spectrum for papain-digested IVIg. (B) Deconvoluted mass spectrum for papain-digested s4-IVIg. (C) Glycosylation profile of IgG1 isotypes in IVIg and s4-IVIg. (D) Glycosylation profile of IgG2/3 isotypes in IVIg and s4-IVIg. (E) Glycosylation profile of IgG4 isotypes in IVIg and s4-IVIg. (F) Fab glycosylation profile for IVIg and s4-IVIg. cps, Cycles per second.