This TAAR feature sure looks like a ligand capture site.

Human TAAR5 may contain an amine-shuttling extracellular α-helix, analogous to a similar structure postulated to exist with a similar function in ORs. TAAR5 is a known receptor for fishy smelling trimethylamine, among other compounds. Like most TAARs, it has an acidic residue inside its ligand binding pocket, located on TMR3 (ASP114) close to a tryptophan […]

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