Enables several functions, including cocaine binding activity; serotonin:sodium symporter activity; and syntaxin-1 binding activity. Involved in several processes, including cellular response to cGMP; cellular response to retinoic acid; and negative regulation of dopaminergic synaptic transmission. Located in several cellular components, including membrane raft; neuron projection; and synapse. Is active in serotonergic synapse. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Used to study anxiety disorder; mental depression; and pulmonary hypertension. Biomarker of Parkinsonism and borna disease. Human ortholog(s) of this gene implicated in several diseases, including alcohol use disorder; alexithymia; anxiety disorder (multiple); heart disease (multiple); and mental depression (multiple). Orthologous to human SLC6A4 (solute carrier family 6 member 4). [provided by Alliance of Genome Resources, Apr 2022]