THE LEWIS-X EPITOPE IS A MAJOR NONREDUCING STRUCTURE IN THE SULFATED N-GLYCANS ATTACHED TO ASN-65 OF BOVINE PROOPIOMELANOCORTIN - SICILIANO, RA; MORRIS, HR; MCDOWELL, RA; AZADI, P; ROGERS, ME; BENNETT, HPJ; DELL, A (GLYCOBIOLOGY, 1993)