1WNL:
reference: Crystal Structures of Biotin Protein Ligase from Pyrococcus horikoshii OT3 and its Complexes: Structural Basis of Biotin Activation., Bagautdinov B, Kuroishi C, Sugahara M, Kunishima N, J Mol Biol 2005 Oct 21;353(2):322-33. PMID: 16169557

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