- Up-regulation of the high-affinity pyrimidine-preferring nucleoside transporter concentrative nucleoside transporter 1 by tumor necrosis factor-alpha and interleukin-6 in liver parenchymal cells. Fernández-Veledo, S., Valdés, R., Wallenius, V., Casado, F.J., Pastor-Anglada, M. J. Hepatol. (2004)