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A stop codon created by oligonucleotide-directed mutagenesis in the proposed transcriptional trans-activator of Rous sarcoma virus (S. Broome and W. Gilbert, Cell 40:537-546, 1985) which truncated the trans-activator by half did not alter the transforming activity or the replication of the virus in primary chicken embryo fibroblasts. This result proves that this trans-activator is not essential for transformation of primary cells by Rous sarcoma virus.

The putative trans-activator in the MAgag region of Rous sarcoma virus is not required for cell transformation