Sodium-dependent and pyrimidine-selective transporter (PubMed:8027026). Exhibits the transport characteristics of the nucleoside transport system cit or N2 subtype (N2/cit) (selective for pyrimidine nucleosides and adenosine) (PubMed:8027026). Transports uridine, cytidine, thymidine, and nucleoside-derived drugs (By similarity). Na(+)(out) + uridine(out) = Na(+)(in) + uridine(in) Na(+)(out) + thymidine(out) = Na(+)(in) + thymidine(in) cytidine(out) + Na(+)(out) = cytidine(in) + Na(+)(in) Expressed predominantly in the brush-border membranes of the polarized epithelial cells of jejunum and renal cortical tubules and in the bile canalicular membranes of liver parenchymal cells. Belongs to the concentrative nucleoside transporter (CNT) (TC 2.A.41) family.