| 1ZVT: reference: The Structural Basis for Substrate Specificity in DNA Topoisomerase IV., Corbett KD, Schoeffler AJ, Thomsen ND, Berger JM, J Mol Biol 2005 Aug 19;351(3):545-61. PMID: 16023670 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).