blood group p antigen and pk antigen were recently identified as glycosphingolipid globoside , galnac ( beta , 1 leads to 3 ) gal ( alpha , 1 leads to 4 ) gas ( beta , 1 leads to 4 ) glc ( beta , 1 leads to 1 ) ceramide , and trihexosylceramide , gal ( alpha , 1 leads to 4 ) gal ( beta , 1 leads to 4 ) gld ( beta , 1 leads to 1 ) ceramide , respectively ( naiki & marcus , 1974 ) .
C0017647
globoside
C0007745
ceramide