The products of the endogenous reverse transcriptase reaction of SIVagmTYO-7 were characterized after the reaction conditions had been optimized. The major reaction product in the presence of actinomycin D and oligo(dT) was a DNA with a size of 300 bases. Without actinomycin D two additional reaction products with 600 or 700 bases appeared. The 300 base product was identified as the (-)strong-stop DNA, whereas the 700 base product is the (+)strong-stop DNA. The 600 base product appeared only after oligo(dT) priming. The (-)strong-stop DNA hybridized specifically with a 9 kb RNA found in virus particles and three RNA species of 1.8, 4.8 and 9 kb isolated from SIVagmTYO-7 infected cells.
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