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Diversity in sialic acid linkage to underlying glycans. Sia is alpha-linked through its C–2 position to galactose (at C–3/4/6; Siaα2–3/4/6Gal), N-acetylgalactosamine (at C–6; Siaα2–6GalNac), N-acetylglucosamine (at C–4/6; Siaα2–4/6GlcNAc), or to another Sia (at C–8/9; Siaα2–8/9Sia)
