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- W2034539300 abstract "A study of the Ca2+ sensitivity of cortical vesicle (CV) discharge has been accomplished using isolated sea urchin egg cortices. Cortices isolated in a medium ionically similar to normal egg cytoplasm discharge 50% of their CVs at 1.6 μM Ca2+ (=[Ca2+]60). Alternatively, cortices isolated in a medium containing 500 mM chaotropic anions (Cl−, Br−, I−, or NO−3) discharge their CVs at 16 μM [Ca2+]60. Incubation with the 500 mM KCl extract of cortices restores high Ca2+ sensitivity and the mode of CV discharge characteristic of cortices before extraction. Fractionation of egg homogenates by differential centrifugation reveals that about 20% of the total restoring activity is associated with the cortex. In eggs of Hemicentrotus pulcherrimus, the factor responsible for this restorative function is a heat and protease labile protein with a molecular weight of 100,000. Similar activity is seen also in the eggs and sperm of other species of sea urchin." @default.
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- W2034539300 date "1984-01-01" @default.
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- W2034539300 title "Modulation of calcium sensitivity by a specific cortical protein during sea urchin egg cortical vesicle exocytosis" @default.
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- W2034539300 doi "https://doi.org/10.1016/0012-1606(84)90123-4" @default.
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