Enables L-glutamine transmembrane transporter activity and L-serine transmembrane transporter activity. Involved in several processes, including cellular response to mechanical stimulus; glycine betaine transport; and neutral amino acid transport. Located in several cellular components, including brush border; neuronal cell body; and sarcolemma. Biomarker of visual epilepsy. Orthologous to human SLC38A2 (solute carrier family 38 member 2). [provided by Alliance of Genome Resources, Apr 2022]