The antibody responses in mice to low doses of the DNP-conjugates of ovomucoid (OM) and bovine gamma-globulin (BGG) were measured for a number of inbred strains carrying independent and recombinant H-2 haplotypes. This permitted mapping the gene(s) controlling the response to low doses of OM (Ir-1-OM) within the I-A subregion of the H-2 complex. Similarly, it was possible to map the primary gene(s) controlling the response to low doses of BGG (Ir-1-BGG) within the I-A and/or I-B subregions. Further localization of the Ir-1-BGG gene(s) to the I-A or I-B subregion of the H-2 complex was not possible due to the ambiguous response of the B10.A(4R) strain of mice.
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