Timing of the phases of the cell cycle with tritiated thymidine and Feulgen cytophotometry during the period of synchronous division in Lymnaea.

Abstract

The duration of the phases of the cell cycle during the 1-, the 2and the 4-cell stage of the Lymnaea egg were determined with [H]thymidine and with Feulgen cytophotometry. The M, S and G2 phases occupy 48, 27 and 25 % of the first three cell cycles. A Gx phase cannot be observed. Only from the 4-cell stage was [H]thymidine readily incorporated into DNA. The theory that an increase in respiration during the S phase of the 4-cell stage is connected with the energy requirements of DNA synthesis is discussed.

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Cite this paper

@article{Biggelaar1971TimingOT, title={Timing of the phases of the cell cycle with tritiated thymidine and Feulgen cytophotometry during the period of synchronous division in Lymnaea.}, author={Jo A M van den Biggelaar}, journal={Journal of embryology and experimental morphology}, year={1971}, volume={26 3}, pages={351-66} }