Septate junctions mediate the barrier to paracellular permeability in sea urchin embryos.

@article{Itza2005SeptateJM,
  title={Septate junctions mediate the barrier to paracellular permeability in sea urchin embryos.},
  author={Erin M Itza and Nancy M. Mozingo},
  journal={Zygote},
  year={2005},
  volume={13 3},
  pages={
          255-64
        }
}
In sea urchin embryos, blastula formation occurs between the seventh and tenth cleavage and is associated with changes in the permeability properties of the epithelium although the structures responsible for mediating these changes are not known. Tight junctions regulate the barrier to paracellular permeability in chordate epithelia; however, the sea urchin blastula epithelium lacks tight junctions and instead possesses septate junctions. Septate junctions are unique to non-chordate… CONTINUE READING
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