Enables glycine transmembrane transporter activity. Involved in glycine transport and neurotransmitter uptake. Located in dense core granule and endosome. Is active in glycinergic synapse. Is integral component of presynaptic membrane. Human ortholog(s) of this gene implicated in hyperekplexia 3. Orthologous to human SLC6A5 (solute carrier family 6 member 5). [provided by Alliance of Genome Resources, Apr 2022]