Nobelprize.org in ’89 for Varmus & Bishop
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Michael Bishop and Harold Varmus used an oncogenic retrovirus to identify the growth-controlling oncogenes in normal cells. In 1976 they published the remarkable conclusion that the oncogene in the virus did not represent a true viral gene but instead was a normal cellular gene, which the virus had acquired during replication in the host cell and thereafter carried along.
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http://www.nobelprize.org/nobel_prizes/medicine/laureates/1989/press.html