Enables glycine transmembrane transporter activity. Involved in glycine import across plasma membrane; neurotransmitter uptake; and positive regulation of cellular biosynthetic process. Acts upstream of or within glycine secretion, neurotransmission. Located in plasma membrane. Is expressed in several structures, including central nervous system; eye; genitourinary system; gut; and liver and biliary system. Used to study glycine encephalopathy. Orthologous to human SLC6A9 (solute carrier family 6 member 9). [provided by Alliance of Genome Resources, Apr 2022]