Definition: A genus of RETROVIRIDAE comprising endogenous sequences in mammals, related RETICULOENDOTHELIOSIS VIRUSES, AVIAN, and a reptilian virus. Many species contain oncogenes and cause leukemias and sarcomas.
Other names Viper retrovirus; Type C Retroviruses, Mammalian; Tumor Viruses, Murine; Retroviruses Type C, Mammalian; Mammalian Type C Retroviruses; retrovirus, Viper; Viper retroviruses; Murine Tumor Viruses; Gammaretroviruses