6EQV:
reference: X-ray Structures of the Proprotein Convertase Furin Bound with Substrate Analogue Inhibitors Reveal Substrate Specificity Determinants beyond the S4 Pocket., Dahms SO, Hardes K, Steinmetzer T, Than ME, Biochemistry. 2018 Feb 13;57(6):925-934. doi: 10.1021/acs.biochem.7b01124. Epub, 2018 Jan 26. PMID: 29314830

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