3QFA:
reference: Crystal structure of the human thioredoxin reductase-thioredoxin complex., Fritz-Wolf K, Kehr S, Stumpf M, Rahlfs S, Becker K, Nat Commun. 2011 Jul 12;2:383. doi: 10.1038/ncomms1382. PMID: 21750537

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