[Characteristics of the type C virus produced by Rous sarcoma virus-transformed hamster cells].

Production of hamster type C virus in Rous sarcoma virus-transformed hamster cells is described. This virus preparation was shown to contain the antigen of the major inner protein of avian type C viruses (p27). The population of virions produced by such cells consists of either of virions of two types (99%--99.9% virions type C of hamster and 0.1%--1% virions the core capsule of which is formed from Rous sarcoma virus p 27) or of virions phenotypically mixed with regard to the major inner protein. The latter possibility seems less likely.