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A variant clone of Snyder-Theilen feline sarcoma virus (ST-FeSV) encoding a polyprotein with a molecular weight of approximately 104 kDa (P104) was compared to the P85 encoding prototype clone of ST-FeSV. Analysis of chimeric genes constructed with the viral oncogenes of the two clones indicated that the variant clone coded for a larger polyprotein than the prototype clone because of genetic differences in its 3' portion. Comparative DNA sequence analysis revealed that one nucleotide just upstream of the termination condon TGA in the prototype proviral DNA was deleted from the variant clone resulting in a 468-bp larger open reading frame. Furthermore, it appeared that the U3 regions of the long terminal repeats (LTRs) of the variant clone contained an insertion of 71 bp as compared to the LTRs of the prototype clone. In addition, both clones differed also from each other with respect to genetic sequences deleted from their env gene regions.
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