Mouse erythroblastosis virus, a member of the mouse leukemia virus group, was obtained from chronically infected C(3)H mouse embryo cells and purified on sucrose gradients. The ribonucleic acid (RNA) extracted from ribonuclease-treated virus consisted of a rapidly sedimenting (72S) species and a more slowly sedimenting component (4 to 30S). The 72S RNA did not contain base sequences homologous to deoxyribonucleic acid (DNA) from infected cells as determined by hybridization studies. In contrast, the slowly sedimenting RNA enclosed within the virus had base sequences homologous to DNA from infected and uninfected C(3)H mouse embryo cells.
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