Abstract
The incorporation of 14C methionine into protein, 14C adenine into RNA, and tritium-thymidine into DNA has been followed autoradiographically over the cell cycle in small groups of Tetrahymena in synchrony. 14C methionine incorporation occurs at a constant rate through the entire interphase. The rate of 14C adenine incorporation into RNA is low during the first half of interphase and high during the last half. The synthesis of DNA, as indicated by tritium-thymidine incorporation, is restricted to the first half of interphase.
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