Unequal cleavage in the early Tubifex embryo.

@article{Shimizu1998UnequalCI,
  title={Unequal cleavage in the early Tubifex embryo.},
  author={Takashi Shimizu and Rumiko Ishii and Hiroki Takahashi},
  journal={Development, growth & differentiation},
  year={1998},
  volume={40 3},
  pages={257-66}
}
Unequal cleavage that produces two blastomeres of different size is a cleavage pattern that many animals in a variety of phyla, particularly in Spiralia, adopt during early development. This cleavage pattern is apparently instrumental for asymmetric segregation of developmental potential, but it is also indispensable for normal embryogenesis in many animals. Mechanically, unequal cleavage is achieved by either simple unequal cytokinesis or by forming a polar lobe at the egg's vegetal pole. In… CONTINUE READING

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