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The 5'-terminal regions of gibbon ape leukemia virus-Hall's Island and Rauscher murine leukemia virus have been completely sequenced. The chain length for the 5'-terminal region of Rauscher murine leukemia virus is 140 nucleotides, and that for gibbon ape leukemia virus-Hall's Island is 144 nucleotides. An alignment of the sequences maximizing the number of ocrrespondences with the minimum introduction of gaps shows 81% nucleotide matches. From the complementary RNA, secondary structures of this region have been proposed. These data demonstrate the conservation of the 5'-terminal genetic sequences of these viruses and strongly reinforce the concept that viruses of murine origin and viruses of the gibbon ape leukemia virus-Simian sarcoma-associated virus group are closely related.

5'-terminal nucleotide sequences of the Rauscher leukemia virus and gibbon ape leukemia virus genomes exhibit a high degree of correspondence