[5-Bromodeoxyuridine inhibition of the transformation of Rous sarcoma virus-infected chicken cells].

The transformation of Rous-Sarcoma-Virus-infected synchronized Chicken cells is prevented when 5-bromodeoxyuridine is added for 3 hrs. at time of the peak of the first S phase following infection. Virus progeny is normally released. The inhibitory effect of BrdU is reversed by simultaneous addition of thymidine, but not by that of deoxyuridine. Hence, the inhibition of the transformation seems to result from the incorporation of the analogue into the nuclear DNA.