The amino acids of M and N blood group glycopeptides are different.
D000596:Amino Acids / Q000097:blood; D004912:Erythrocytes / Q000032:analysis*; D005971:Glutamates / Q000097:blood; D005998:Glycine / Q000097:blood; D006020:Glycopeptides / Q000097:blood*; D006801:Humans; D007930:Leucine / Q000097:blood; D008951:MNSs Blood-Group System; D012694:Serine / Q000097:blood
D000596:Amino Acids; D005971:Glutamates; D006020:Glycopeptides; D008951:MNSs Blood-Group System; D012694:Serine; D007930:Leucine; D005998:Glycine