0 a small sea creature that lives in water that is not very deep, has a round shell covered with sharp points like needles, and has flesh that can be eaten
Proteolysis of the major yolk glycoproteins is regulated by acidification of the yolk platelets in sea urchin embryos.
In animal systems, studies on the activation of sea urchin and clam eggs have also found changes in enzyme activity and location.
Localisation of fluorescently labelled calmodulin in living sea urchin eggs during early development.
Changing localizations of site-specific surface antiperhaps sequential patterns of gene expression during gens during sea urchin spermiogenesis.
The sea urchin egg is a model for such studies.
A localized zone of increased conductance progresses over the surface of the sea urchin egg during fertilization.
For example, in sea urchin oocytes, calciuminduced cortical granule exocytosis leads to the formation of a zygote with a mosaic plasma membrane.
Characteristics of individual repetitive sequence families in the sea urchin genome studied with cloned repeats.
