DBA/1, DBA/2, CBA/N, and CBA/Ca mice carry a gene which specifically restricts infectivity of mink cell focus-forming (MCF) murine leukemia viruses. The gene, designated Rmcfr, is dominant or semidominant and maps to chromosome 5; it is closely linked to the morphologic marker gene Hm. The Rmcf gene may be of much use as a means of determining the role of MCF viruses in various forms of leukemogenesis.

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