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The Phosphoinositide Pathway: PIP2 to DAG and IP3

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The phosphoinositide pathway converts a membrane phospholipid into two second messengers, diacylglycerol and inositol triphosphate, when a G-protein-linked receptor activates the enzyme phospholipase C.

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Diacylglycerol and inositol triphosphate come from the same cleavage event but act through separate downstream targets — one at the membrane, one released into the cytoplasm.