. "Edited: Williams, MG, 2011-08-12"^^ . "Reviewed: Wakelam, Michael, 2012-05-14"^^ . "Authored: Williams, MG, 2011-10-18"^^ . "At the plasma membrane, phosphatidylinositol-4-phosphate 5-kinase type-1 alpha (PIP5K1A) and beta (PIP5K1B) phosphorylate phosphatidylinositol (PI) to produce phosphatidylinositol 5-phosphate (PI5P) (Tolias et al. 1998)."^^ . . . . . . "PI is phosphorylated to PI5P by PIP5K1A/B at the plasma membrane"^^ . . . . .