Enables L-glutamine transmembrane transporter activity. Acts upstream of or within glutamine transport. Located in axon and basolateral plasma membrane. Is expressed in several structures, including alimentary system; extraembryonic component; genitourinary system; nervous system; and sensory organ. Orthologous to human SLC38A1 (solute carrier family 38 member 1). [provided by Alliance of Genome Resources, Apr 2022]