Voorbeelden van sea urchin

• 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.

• Localization and possible role of molecules acetylcholinesterase in sea urchin embryos.

• Good candidates may be the yolk platelets, acidic vesicles and pigment granules, all of which are present in sea urchin eggs.

• Ligand-dependent stimulation of introduced mammalian brain receptors alters spicule symmetry and other morphogenetic events in sea urchin embryos.

• Experimental separation of pronuclei in fertilised sea urchin eggs: chromosomes do not organise a spindle in the absence of centrosomes.

• Redundant mechanisms of calcium-induced calcium release underlying calcium waves during fertilization of sea urchin eggs.

• Microinjection of inositol triphosphate activates sea urchin eggs.

• Microtubules are required for completion of cytokinesis in sea urchin eggs.