| 1DTP: reference: Structure of the isolated catalytic domain of diphtheria toxin., Weiss MS, Blanke SR, Collier RJ, Eisenberg D, Biochemistry 1995 Jan 24;34(3):773-81. PMID: 7827036 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).