Enables beta-alanine transmembrane transporter activity and taurine transmembrane transporter activity. Involved in modulation of chemical synaptic transmission. Acts upstream of or within beta-alanine transport and taurine transport. Located in GABA-ergic synapse. Is integral component of postsynaptic membrane. Is expressed in several structures, including cardiovascular system; central nervous system; placenta; retina; and tooth. Used to study retinitis pigmentosa. Orthologous to human SLC6A6 (solute carrier family 6 member 6). [provided by Alliance of Genome Resources, Apr 2022]