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This product provides a water-soluble representation of phosphatidylinositol (PI or PtdIns), which is functionalized with biotin at the sn-1 carbon. As the foundational lipid for the entire family of phosphoinositides, PI is essential for signaling pathways involved in cellular communication. Its biosynthesis occurs through the condensation of CDP-diacylglycerol and inositol, catalyzed by phosphatidylinositol synthase.