a locus ( classical histocompatibility antigens ) of the bn strain , a locus from the bn strain that codes for the expression of an ia antigen and strong mixed lymphocyte response ( mlr ) , and a second locus derived from the p1 haplotype that controls the expression of a second ia antigen , the ability to elicit a strong mlr and the immune response to poly ( glu52lys33tyr15 ) .
C0019628
histocompatibility antigens
C0019630
ia antigen