Phosphorylation of phosphatidylinositol yields __________
(a) Phosphatidylinositol 4, 5-biphosphate
(b) Phosphatidylinositol 3, 5-biphosphate
(c) Phosphatidylinositol 3, 4-biphosphate
(d) Phosphatidylinositol 5, 6-biphosphate
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