The activation of the egg to begin development into an embryo is triggered by a sperm-induced increase in intracellular egg Ca2+. There has been much controversy about how the sperm induces this fundamental developmental event, but recent studies suggest that, in mammals, egg activation is triggered by a testis-specific phospholipase C: PLCzeta. Since the discovery of PLCzeta, it has been unclear whether its role in triggering egg activation is common to all vertebrates, or is confined to mam...Expand abstract
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Phospholipase Czeta, the trigger of egg activation in mammals, is present in a non-mammalian species.
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