Identification of specificity H-2.7 as an erythrocyte antigen: Control by an independent locus, H-2G, between the S and D regions

Specificity H-2.7 is expressed predominantly on erythrocytes and controlled by a gene that maps within the H-2 gene complex at a locus, designated as H-2G, which apparently lies between regions S and D. Three phenotypes have been observed with respect to this antigen: a) positive by direct test and absorption (haplotypes H-2^f, H-2^j, H-2^p, H-2^s); b) positive only by absorption (H-2^k); and c) negative (H-2^b, H-2^d, H-2^q). New crossover positions have been established for several H-2 recombinants based on classifications for the H-2G locus.