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Cell lines transformed by woolly monkey sarcoma virus (WSV) in the absence of infectious virus production were analyzed for the expression of woolly monkey helper viral p30, p12, and gp70 antigens. Several lines produced high levels of both p30 and p12, whereas gp70 was not detectable. One transformed clone expressed only p12, and in another cell line, none of the helper viral antigens were detected. The properties of each sarcoma virus bred true upon transmission, indicating that each variant represents a distinct genotype. The different cell lines were examined with respect to properties characteristic of the transformed state. The in vitro growth properties and oncogenicity of each WSV-transformed clone were indistinguishable, indicating that transformation by WSV occurs independently of the expression of at least three helper viral polypeptides.

Differential expression of helper viral structural polypeptides in cells transformed by clonal isolates of woolly monkey sarcoma virus