Abstract
The genetic basis for autoimmunity in NZB mice has been investigated through analysis of recombinant inbred lines produced by mating NZB mice with two different non-autoimmune strains. Several genes (at least six) were found to be necessary for the production of eight traits characteristic of the NZB mice that were studied. No fundamental genetic defect (an "autoimmunity gene") was identified that could give rise to the various autoimmune traits studied. This study strongly suggests that NZB disease results from the actions of several separate genes that together result in the characteristic manifestations of autoimmunity.