Immunoprecipitations of in vitro translation products of mRNA from adult Schistosoma mansoni worms with sera from chronically infected mice of 12 inbred strains reveal a strain-dependent heterogeneity in the antibody responses to schistosome antigens. Of the strains tested the response to the 86K antigen was restricted to mice of haplotypes H-2d H-2k, and H-2a while the 14K antigen was only recognized by H-2k mice. Responses to other antigens revealed the influence of non-H-2 genes on the antibody response although no clear correlation was apparent between the antigens recognized and the non-H-2 genes of the strains. Both dominant and recessive responses towards individual antigens were seen in F1 animals. Some of these results support the cross tolerance model of Ir gene function.
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