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Previous research has shown that cortical gradients of cytosolic Ca2+ are formed during the photopolarization of Pelvetia compressa zygotes, with elevated Ca2+ on the shaded hemisphere that will become the site of rhizoid germination. We report here that the marine sponge toxin, latrunculin B, which blocks photopolarization at nanomolar concentrations, inhibited the formation of the light-driven Ca...
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