Genetic control of the immune response to the GAT terpolymer. I. Interstrain and interspecies cross-reactive idiotype.

An antiidiotypic antiserum specific for the GAT antibodies of BALB/c mice has been obtained in rabbits. This serum recognizes the GAT idiotype of 13 inbred strains of mice as well as the GAT idiotype present in sera of guinea-pigs, rats and rabbits immunized with GAT. Such an antiidiotypic antiserum should serve as a good reagent to detect putative idiotypic determinants on GAT-specific suppressor factor.