Enables neutral amino acid transmembrane transporter activity. Acts upstream of or within neutral amino acid transport. Located in apical plasma membrane and brush border membrane. Is expressed in metanephros. Used to study Hartnup disease. Human ortholog(s) of this gene implicated in Hartnup disease and iminoglycinuria. Orthologous to human SLC6A19 (solute carrier family 6 member 19). [provided by Alliance of Genome Resources, Apr 2022]