2ZZT:
reference: Crystal structure of the cytosolic domain of the cation diffusion facilitator family protein., Higuchi T, Hattori M, Tanaka Y, Ishitani R, Nureki O, Proteins. 2009 Aug 15;76(3):768-71. PMID: 19422055

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