Dev Biol 1991 Nov 01;1481:398-401. doi: 10.1016/0012-1606(91)90348-7.

Characterization of sea urchin egg endoplasmic reticulum in cortical preparations.

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The cortical endoplasmic reticulum (ER) of sea urchin eggs was localized on isolated egg cortices by staining with aqueous suspensions of the dicarbocyanine "DiI." Immunofluorescence localization of a calsequestrin-like protein was essentially identical; this is consistent with a role for the ER in calcium regulation. The ER often encircles cortical granules, making it well-suited for initiating fusion and propagating the calcium wave. Thiazole orange and Hoechst dye 33258 at pH 2 stain ribosomes bound to the ER, providing evidence that the cortical ER is rough ER. High chloride concentrations were found to disrupt ER continuity.

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Genes referenced: LOC100887844 LOC105444658