6ZPT:
reference: Angiotensin-converting enzyme open for business: structural insights into the sub-domain dynamics., Cozier GE, Lubbe L, Sturrock ED, Acharya KR, FEBS J. 2020 Oct 17. doi: 10.1111/febs.15601. PMID: 33067882

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