SEROLOGICAL DISTINCTION OF MUTANTS B6.C-H(z1) AND B6.M505 FROM STRAIN C57BL/6

A quantitative serological difference was found between strains Hz1 and M505 carrying mutant H-2 haplotypes ba and bd, respectively, and the original strain B6(H-2^b). The finding suggests that the mutations occurred in the H-2K^b gene, and together with data on MLR and CML challenges the current concept of H-2 regions' involvement in immune reactions.