Abstract
Abstract Two viruses isolated following prolonged growth of serologically distinct mouse type C RNA viruses in human cells have previously been shown to have acquired common envelope properties distinct from those of either parental virus. Virus neutralization tests show that the viruses selected in human cells possess envelope antigens identical to those of endogenous mouse type C viruses of cells in which the parental viruses had been propagated. In contrast, the p12 polypeptide of each virus selected in human cells is antigenically indistinguishable from that of its respective parental virus and different from those of known endogenous mouse type C viruses. Molecular hybridization indicates significant differences in the genetic sequences of one virus and its parent, excluding the possibility that it arose from a point mutation. These findings indicate that the viruses selected in human cells represent genetic recombinants between exogenous and endogenous mouse type C viruses.
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