2RIF:
reference: Structures and functional implications of an AMP-binding cystathionine beta-synthase domain protein from a hyperthermophilic archaeon., King NP, Lee TM, Sawaya MR, Cascio D, Yeates TO, J Mol Biol. 2008 Jun 27;380(1):181-92. Epub 2008 May 7. PMID: 18513746

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