Biochemistry. A phospholipid in which the sugar inositol is attached to the phosphate group of phosphatidic acid by an ester linkage. It is a minor constituent of cell membranes found primarily in the plasma membrane. It is converted by specific enzymes to mono- and diphosphorylated forms, phosphatidylinositol 4,5-bisphosphat that is involved in hormonally activated calcium mobilization.
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