4PB1:
reference: Structural basis of nucleoside and nucleoside drug selectivity by concentrative nucleoside transporters., Johnson ZL, Lee JH, Lee K, Lee M, Kwon DY, Hong J, Lee SY, Elife. 2014 Jul 31:e03604. doi: 10.7554/eLife.03604. PMID: 25082345

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).