ENT1, or Solute carrier family 29 (equilibrative nucleoside transporter), member 1, is a human gene encoded by SLC29A1. It may also be known as: Equilibrative nucleoside transporter 1; Equilibrative NBMPR-sensitive nucleoside transporter; Nucleoside transporter, es-type; Solute carrier family 29 member 1; Equilibrative nitrobenzylmercaptopurine riboside-sensitive nucleoside transporter. The encoded protein has an amino acid length of 456 and a mass of 50.2 kDa. ENT1 is a member of the SLC29A/ENT transporter (TC 2.A.57) family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.