4Z3B:
reference: A Photoactive Carbon-Monoxide-Releasing Protein Cage for Dose-Regulated Delivery in Living Cells., Fujita K, Tanaka Y, Abe S, Ueno T, Angew Chem Int Ed Engl. 2015 Sep 2. doi: 10.1002/anie.201506738. PMID: 26332099

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