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Since little is known about the function of polypeptide growth factors as regulators of multiple cell cycles, we compared the ability of FGF1, PDGF-AB and serum to induce a second round of DNA synthesis in Swiss 3T3 cells previously exposed to either FGF1, PDGF-AB or serum during the first cell cycle using [ 14 C]- and [ 3 H] thymidine in a double labeling system to distinguish between...
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