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GM3 (monosialodihexosylganglioside) is a type of ganglioside. The letter G refers to ganglioside, and M is for monosialic acid as it has one sialic acid only. The numbering is based on its relative mobility in electrophoresis among other monosialic gangliosides. Its structure can be condensed to NANA-Gal-Glc-ceramide.
References
GM3 Wikipedia(Text) CC BY-SA