1. Three non-major histocompatability complex genes, Idd-3, Idd-4 and Idd-5, that influence the onset of autoimmune type 1 diabetes in the non-obese diabetic mouse have been located on chromosomes 3, 11 and 1.
2. In undertaking this study, a new map of the mouse genome has been created from polymerase chain reaction-analysable mouse microsatellite markers.
3. The homologues of these genes may reside on human chromosomes 1 or 4 (Idd-3), 17 (Idd-4) and 2q (Idd-5).