High-frequency twinning of Xenopus laevis embryos from eggs centrifuged before first cleavage.

@article{Black1986HighfrequencyTO,
  title={High-frequency twinning of Xenopus laevis embryos from eggs centrifuged before first cleavage.},
  author={Shaun D. Black and John C. Gerhart},
  journal={Developmental biology},
  year={1986},
  volume={116 1},
  pages={
          228-40
        }
}
In embryos of the frog Xenopus laevis, the dorsal structures normally develop from regions of the egg opposite the side of sperm entry. Gravity and centrifugal force, applied at an angle of 90 degrees to the animal-vegetal axis of the egg, can override this topographic relationship and can cause the dorsal structures to be positioned according to the force vector (S. Black and J. Gerhart, 1985, Dev. Biol. 108, 310-324). We report here that at time 0.40 (40% of the first cleavage interval), an… CONTINUE READING
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