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The four major brain gangliosides of mammals and birds share the same neutral tetrasaccharide core (Gal β1–3 GalNAc β1–4 Gal β1–4 Glc) attached to ceramide, with varying numbers and linkage positions of sialic acids. The sugars are color-coded: yellow, Gal/GalNAc; blue, Glc; and purple, NeuAc. Molar percentages are for total human brain gangliosides.
