Enables G protein-coupled serotonin receptor activity. Involved in several processes, including behavioral fear response; serotonin metabolic process; and serotonin receptor signaling pathway. Acts upstream of or within gamma-aminobutyric acid signaling pathway. Predicted to be located in axon hillock. Predicted to be active in dendrite. Predicted to be integral component of plasma membrane. Is expressed in several structures, including central nervous system; exocrine gland; eye; genitourinary system; and intestine. Used to study anxiety disorder. Human ortholog(s) of this gene implicated in anxiety disorder; mental depression; and panic disorder. Orthologous to human HTR1A (5-hydroxytryptamine receptor 1A). [provided by Alliance of Genome Resources, Apr 2022]