Isolated cortices from sea urchin eggs accumulate calcium in a non-mitochondrial store at a rate dependent on ATP and enhanced by oxalate. Calcium efflux is increased by ionomycin and by A23187 which has been used as a parthenogenetic agent, but not by weak base (NH4Cl). Accumulated calcium is partially released by 1,4,5 inositol triphosphate.
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Payan et al. (1986) studied this question.
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