3EW1:
reference: Crystal structure of rhizavidin: insights into the enigmatic high-affinity interaction of an innate biotin-binding protein dimer., Meir A, Helppolainen SH, Podoly E, Nordlund HR, Hytonen VP, Maatta JA, Wilchek M, Bayer EA, Kulomaa MS, Livnah O, J Mol Biol. 2009 Feb 20;386(2):379-90. Epub 2008 Dec 24. PMID: 19111749

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