214 Chapter 4. Structure and functions of biological membranes. Cell signaling pathways Table 4.1. Adenylyl cyclase and phosphatidylinositol 4',5'-bisphosphate (PIP,) signaling pathways Structure and Function Ihositol phosphate Adenyly! cyclase system system An example of the primary messenger Integral membrane protein, complementary binding the primary messenger primary Protein, activating the enzyme of the signaling system

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