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Gated ion channel Serpentine receptor Opens or closes in External ligand binding to receptor(r)activates an response to concentration intracellular GTP-binding of signal ligand (S) or membrane potential protein(G), which regulates an enzyme(Enz)that ates an intracellular Ion nd me X R Plasma Receptor enzyme membrane Ligand binding to stimulates enzyme activity in intracellular Steroid DNA Steroid binding to a nuclear receptor protein allows the mRNA ptor to regulat Nuclear the expression of envelope Protein specihc genesFour general types of signal transducers
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