Spleen Focus-Forming Viruses

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Spleen Focus-Forming Viruses

Strains of Murine leukemia virus (LEUKEMIA VIRUS, MURINE) that are replication-defective and rapidly transforming. The envelope gene plays an essential role in initiating erythroleukemia (LEUKEMIA, ERYTHROBLASTIC, ACUTE), manifested by splenic foci, SPLENOMEGALY, and POLYCYTHEMIA. Spleen focus-forming viruses are generated by recombination with other viral types.