Lymphocytes from tx-mutant mice have a definite and consistent pattern of reactivity in MLR. Cells from t-mutant mice within a complementation group usually fail to stimulate each other, while cells from mutants in different complementation groups stimulate each other strongly. This indicates that tx-mutant types are associated with certain H-2 haplotypes, and that members of any give complementation group share the same H-2 haplotype.

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