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Examples of naturally occurring sialic acid and nonulosonic acid structures. Neu (a) and Kdn (b) are the two most basic Sia forms. Neu5Ac (c) and Neu5Gc (d) are derived from Neu and are the two most abundant Sia structures found in mammals. Leg (e) and Pse (f) are two representatives of the nonulosonic acid family that used to be known as the “bacterial Sias.”
