| 3TIJ: reference: Crystal structure of a concentrative nucleoside transporter from Vibrio cholerae at 2.4 A., Johnson ZL, Cheong CG, Lee SY, Nature. 2012 Mar 11;483(7390):489-93. doi: 10.1038/nature10882. PMID: 22407322 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).