A cytoplasmic clock with the same period as the division cycle in Xenopus eggs.

@article{Hara1980ACC,
  title={A cytoplasmic clock with the same period as the division cycle in Xenopus eggs.},
  author={Koki Hara and Peter Tydeman and Marc W Kirschner},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1980},
  volume={77 1},
  pages={
          462-6
        }
}
In most species the cell cycle is arrested in the unfertilized egg. After fertilization the cell cycle is reestablished and a rapid series of cleavages ensues. Preceding the first cleavage in Xenopus the egg undergoes a contraction of its cortex, called the "surface contraction wave," which can be visualized by time-lapse cinematography. This wave of contraction is propagated in a circular manner from the animal pole to the equator. We have found that eggs prevented from cleaving by treatment… CONTINUE READING
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