1K44:
reference: X-ray structure of Mycobacterium tuberculosis nucleoside diphosphate kinase., Chen Y, Morera S, Mocan J, Lascu I, Janin J, Proteins 2002 Jun 1;47(4):556-7. PMID: 12001234

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