Location of the Second Gene Required for Expression of the Leukemia-Associated Mouse Antigen G IX

Abstract
Some mouse strains express GIX antigen on their thymocytes; others do not. Expression depends on two genes, Gv-1 and Gv-2, in linkage groups IX and I, respectively. Cells producing leukemia virus, however, express GIX antigen regardless of their inherited Gv-1 and Gv-2 genotype.