GM2A is a gene which encodes a small glycolipid transport protein and also stimulates the enzymatic processing of gangliosides, which are molecules devoid of any acids or chemicals.
A ganglioside is a molecule composed of a glycosphingolipid (ceramide and oligosaccharide) with one or more sialic acids (e.g. n-acetylneuraminic acid, NANA) linked on the sugar chain. GM2A is a lipid transfer protein that stimulates the enzymatic processing of gangliosides, and also T-cell activation through lipid presentation. 
