3UZY:
reference: Conversion of human steroid 5beta-reductase (AKR1D1) into 3beta-hydroxysteroid dehydrogenase by single point mutation E120H: example of perfect enzyme engineering., Chen M, Drury JE, Christianson DW, Penning TM, J Biol Chem. 2012 May 11;287(20):16609-22. Epub 2012 Mar 20. PMID: 22437839

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