| 1NDK: reference: X-ray structure of nucleoside diphosphate kinase., Dumas C, Lascu I, Morera S, Glaser P, Fourme R, Wallet V, Lacombe ML, Veron M, Janin J, EMBO J 1992 Sep;11(9):3203-8. PMID: 1324167 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).