ganglioside galactosyltransferase; UDP-galactose---ceramide galactosyltransferase; uridine diphosphogalactose-ceramide galactosyltransferase; UDP galactose-LAC Tet-ceramide alpha-galactosyltransferase; UDP-galactose-GM2 galactosyltransferase; uridin • • •