5LTI:
reference: An oxidative N-demethylase reveals PAS transition from ubiquitous sensor to enzyme., Ortmayer M, Lafite P, Menon BR, Tralau T, Fisher K, Denkhaus L, Scrutton NS, Rigby SE, Munro AW, Hay S, Leys D, Nature. 2016 Nov 24;539(7630):593-597. doi: 10.1038/nature20159. Epub 2016 Nov, 16. PMID: 27851736

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