Abstract
A large number of related chimpanzees were tested in mixed lymphocyte cultures against each other. Several similarities among the D locus products coded for by different ChLA haplotypes were observed. Six animals were homozygous for D locus antigens and 2 of these animals carried the same D specificity. Hence, the available typing cells permitted the identification of 5 D locus antigens of the chimpanzee. So far, no linkage disequilibrium was found between any of the D locus antigens and ChLA-A or -B locus antigens.