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We have studied the nucleic acid sequences in nonproducer cells transformed by Moloney sarcoma virus or Abelson leukemia virus (two types of replication-defective, RNA-containing, viruses isolated by passage of Moloney leukemia virus in BALB/c mice). DNA probes from the Moloney leukemia in virus detect RNA in both Abelson virus-transformed nonproducer cells and Moloney sarcoma virus-transformed nonproducer cells. A sarcoma-specific cDNA, prepared from the Moloney sarcoma virus, has extensive homology to RNA found in heterologous nonproducer cells transformed by Moloney sarcoma virus, has little homology to RNA in cells producing Moloney leukemia virus, and no detectable homology to RNA in nonproducer cells transformed by the Abelson virus. By analogy to earlier data on avian and mammalian sarcoma viruses, these results suggest that the Moloney sarcoma virus arose by recombination between a portion of the Moloney leukemia virus genome and additional sarcoma-specific information, and indicate that the expression of this information in not essential for Abelson virus-mediated fibroblast transformation.
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