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A murine sarcoma virus (MSV-h) which causes sarcomas and other lesions in mice, rats, Praomys and hamsters was described by Harvey (1964, 1968), Chesterman et al. (1966) and East & Harvey (1968). Mouse or rat tumours induced by MSV-h and grown in tissue culture readily released virus infective for both species; in contrast virus produced by hamster tumour cultures was active only in hamsters (Bassin et al. 1968; Harvey, 1968). One such hamster tumour culture, B34 established by Dr R. Bassin, is currently being maintained in our laboratory. ‘Hamster specific’ MSV-h, when examined by electron microscopy, cannot be distinguished from fully infective MSV-h or any of the well known type C murine leukaemia viruses (Chesterman et al. 1966; Bassin et al. 1968).
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