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Movements of Echinochrome Granules during the Early Development of Sea Urchin Eggs

Abstract

ECHINOCHROME pigment granules in unfertilized eggs of the sea urchin Arbacia punctulata undergo randomly-directed saltatory movements1,2. After fertilization, nearly all these granules migrate to the egg cortex and become embedded. Subsequent pigment granule movements may represent mass cortical changes rather than independent granule movements2,3. At the fourth cleavage, a quartet of micromeres containing little or no pigment forms at the vegetal pole. By the two or four-cell stage, pigment granules have begun to move out of this region, leaving a “clear area” on each blastomere (Fig. 1 and refs. 4, 5). To investigate possible mechanisms for these movements and their relation to cortical events

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BELANGER, A., RUSTAD, R. Movements of Echinochrome Granules during the Early Development of Sea Urchin Eggs. Nature New Biology 239, 81–83 (1972). https://doi.org/10.1038/newbio239081a0

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  • DOI: https://doi.org/10.1038/newbio239081a0

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