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Echinobase
ECB-ART-30488
J Exp Zool 1978 Jan 01;2031:143-9. doi: 10.1002/jez.1402030114.
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Uptake of Ca2+ is one of the earliest responses to fertilization of sea urchin eggs.

Paul M , Johnston RN .


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Sea urchin eggs take up Ca for 10 min following insemination (determined as uptake of 45Ca from the SW (3)). Although 90% of this uptake occurs after the beginning of the cortical reaction and may represent external binding of Ca to the egg surface coats, there is a brief phase of uptake (o-30 sec) which precedes the cortical reaction; this may represent a Ca flux into the eggs.

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Genes referenced: LOC100887844