Enables nucleoside transmembrane transporter activity. Involved in several processes, including cellular response to glucose stimulus; lactation; and uridine transport. Located in plasma membrane. Is active in postsynapse and presynapse. Used to study brain ischemia. Orthologous to human SLC29A1 (solute carrier family 29 member 1 (Augustine blood group)). [provided by Alliance of Genome Resources, Apr 2022]