Contributes to chloride channel activity. Involved in chloride transmembrane transport and membrane depolarization. Acts upstream of or within chloride transport and sensory perception of smell. Located in cilium. Part of chloride channel complex. Is expressed in ovary; submandibular gland; testis; and thymus. Orthologous to human BEST2 (bestrophin 2). [provided by Alliance of Genome Resources, Apr 2022]