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Simplified model of olfactory signal transduction within OSN cilium. ACIII: adenylyl cyclase; AR: adrenergic receptor; BEX: Brain-expressed X-linked protein; ClC: sodium/calcium exchanger; Golf: olfactory g-protein; M3-R: muscarinic acetylcholine receptor; oCGC: olfactory cyclic nucleotide-gated channel; OMP: olfactory marker protein; OR: odorant receptor. The Na+/K+/Cl− cotransporter is not shown. Black arrows: stimulation; red arrows: inhibition (after [7] cf. [8]).
