[Absence of the chemical activation of type C endogenous viruses in cells of 129/J mice].

Production of Type C virus by Mouse cells generally activated by chemical agents does not occur in 129/J Mouse cells. No viral production, as tested by reverse transcriptase activity and electron microscopic methods can be detected in cells treated by chemical inducers. Immunofluorescence does not reveal the presence of viral specific proteins and viral RNA expression determined by molecular hybridization between cellular RNA and viral cDNA does not increase as it does in BALB/c cells under the action of the inducers studied.