Figure 1.

Muscarinic Receptors and the Phosphatidylinositol (PI) Cycle. Abbreviations: ACh, acetylcholine; Gq, GTP-binding protein; PLC-b1, phospholipase C, b1 isozyme; PI, phosphatidylinositol; PIP2, phosphatidylinositol 4,5-bisphosphate; DAG, 1,2-diacyl-sn-glycerol; IP3, D-myo-inositol 1,4,5-trisphosphate; IP2, D-myo-inositol 1,4-trisphosphate; IP1, D-myo-inositol 1-trisphosphate; PA, phosphatidic acid; CDP-DG, cytidine diphosphodiacylglycerol; PIP, phosphatidylinositol 4-phosphate; PKC, protein kinase C.

published 2000