FIG. 5.

Endogenous reverse transcription assay of equilibrium density fractions containing the peak of the viral DNA from cytoplasmic extracts collected 1, 4, and 7 h postinfection. Samples diluted 1:10 were incubated for 6 h at 37°C in the presence (+) or absence (−) exogenous dNTPs and then subjected to PCR with primers specific for the (+)-strand DNA (expected band size is 600 bp).