Enables nucleoside transmembrane transporter activity. Involved in several processes, including lactation; nucleobase transport; and uridine transport. Predicted to be located in presynapse. Predicted to be integral component of plasma membrane. Predicted to be active in basolateral plasma membrane. Predicted to be integral component of membrane. Orthologous to human SLC29A2 (solute carrier family 29 member 2). [provided by Alliance of Genome Resources, Apr 2022]