1OSN:
reference: Crystal structure of varicella zoster virus thymidine kinase., Bird LE, Ren J, Wright A, Leslie KD, Degreve B, Balzarini J, Stammers DK, J Biol Chem 2003 Jul 4;278(27):24680-7. Epub 2003 Apr 9. PMID: 12686543

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