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Polypeptide growth factors play an important role in the in 'itr)o growth of many human cancer cells (Rozengurt, 1983; Goustin et al., 1986). Recently, factors have been identified which are unique in their ability to induce a transformed phenotype on normal cells in culture (DeLarco & Todaro, 1978). Exposure of cells to these factors causes loss of(More)
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