| 3NCP: reference: Cooperative binding of MgATP and MgADP in the trimeric P(II) protein GlnK2 from Archaeoglobus fulgidus., Helfmann S, Lu W, Litz C, Andrade SL, J Mol Biol. 2010 Sep 10;402(1):165-77. Epub 2010 Jul 17. PMID: 20643148 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).