Sodium-dependent and purine-selective transporter. Exhibits the transport characteristics of the nucleoside transport system cif or N1 subtype (N1/cif) (selective for purine nucleosides and uridine). Plays a critical role in specific uptake and salvage of purine nucleosides in kidney and other tissues. adenosine(out) + Na(+)(out) = adenosine(in) + Na(+)(in) inosine(out) + Na(+)(out) = inosine(in) + Na(+)(in) guanosine(out) + Na(+)(out) = guanosine(in) + Na(+)(in) Na(+)(out) + uridine(out) = Na(+)(in) + uridine(in) Belongs to the concentrative nucleoside transporter (CNT) (TC 2.A.41) family.