Abstract
The effect of an H-2IJ disparity on skin graft survival was studied in 18 mouse donor-recipient strain combinations, in which the recipients were treated with an efficient immunosuppressant, lentil lectin (LCA). The simultaneous I-J disparity essentially had no (or a slightly adverse) effect on the graft survival times in strain combinations differing at the K and I-A loci or in the entire H-2 complex. In two strain combinations incompatible at the D locus, the simultaneous I-J disparity promoted graft survival. The disparity at the I-J locus therefore seems to have only a marginal effect on the survival of allografts in most of the LCA-treated recipients, but it may promote graft survival in some animals. A similar tolerance-promoting effect was also observed with D disparity.
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