Abstract
The primary response to Thy-1.1 antigen was measured by a plaque assay that detected cells producing antibodies lytic for AKR thymocytes (PFC). TheH-2 congenic mice (B10.K and B10.BR) carryingH-2 complexes of high responders (CBA and C57BR) on the low-responder background (B10) were found to produce significantly fewer PFC than the corresponding donor of theH-2 complex. On the other hand, C3H.B10 mice carrying theH-2 complex of a low responder on the high-responder background produced significantly more PFC than the donor of theH-2 complex. These findings were interpreted as evidence that alleles at previously described loci believed to be components of theI region of theH-2 complex and controlling immune response to Thy-1.1 are influenced by alleles at another locus. Studies of segregating populations of theH-2 congenic lines supplied evidence that this locus, tentatively calledIr-5, is in chromosome 17 (linkage group IX).
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