Enables L-glutamine transmembrane transporter activity. Involved in glutamine transport. Acts upstream of or within amino acid transport. Located in plasma membrane. Is expressed in several structures, including brain meninges; extraembryonic component; genitourinary system; phalanx; and tooth. Orthologous to human SLC38A2 (solute carrier family 38 member 2). [provided by Alliance of Genome Resources, Apr 2022]