1RXK:
reference: Structural elements responsible for conversion of streptavidin to a pseudoenzyme., Eisenberg-Domovich Y, Pazy Y, Nir O, Raboy B, Bayer EA, Wilchek M, Livnah O, Proc Natl Acad Sci U S A 2004 Apr 20;101(16):5916-21. Epub 2004 Apr 12. PMID: 15079055

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