Integrating Factors

  • J. Runnström


The sea urchin egg has already in the ovary an animal-vegetal polarity that is maintained in embryo development even when the axis through the animal and vegetal pole is bent after gastrulation. The cytoplasm around the animal and vegetal poles shows structural differences (RUNNSTRÖM, 1928c, 1955b).


Template Activity Dorsoventral Axis Paracentrotus Lividus Vegetal Gradient Attachment Zone 
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