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Labeled virions of Rous sarcoma virus (RSV) were disrupted with detergent and analyzed on equilibrium sucrose density gradients. A core fraction at a density of approximately 1.24 g/cc contained all of the3 H-uridine label and about 30% of the3 H-leucine label from the virions. Endogenous viral deoxyribonucleic acid (DNA) polymerase activity was only found in the same location. Additional ribonucleic acid (RNA)- and DNA-dependent DNA polymerase activities were found at the top of the gradients. RNA-dependent and DNA-dependent DNA polymerase activities were also found in RSV-converted chicken cells. Particles containing these activities were released from cells by detergent and were shown to contain viral RNA. These particles were analyzed on equilibrium sucrose density gradients and were found to have densities different from virion cores.

journal of virology

Comparison of Rous Sarcoma Virus-Specific Deoxyribonucleic Acid Polymerases in Virions of Rous Sarcoma Virus and in Rous Sarcoma Virus-Infected Chicken Cells