hla-a3.1 and the rare variant hla-a3.2 have been shown to differ by two amino acids in the alpha 2 domain at positions 152 ( a3.1 , glutamic acid ; a3.2 , valine ) and 156 ( a3.1 , leucine ; a3.2 , glutamine ) .
C0002520
amino
C0061472
glutamic acid