4TW5:
reference: The eps1p protein disulfide isomerase conserves classic thioredoxin superfamily amino Acid motifs but not their functional geometries., Biran S, Gat Y, Fass D, PLoS One. 2014 Dec 1;9(12):e113431. doi: 10.1371/journal.pone.0113431., eCollection 2014. PMID: 25437863

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