3WYO:
reference: Rational Design of Heterodimeric Protein using Domain Swapping for Myoglobin., Lin YW, Nagao S, Zhang M, Shomura Y, Higuchi Y, Hirota S, Angew Chem Int Ed Engl. 2014 Nov 4. doi: 10.1002/anie.201409267. PMID: 25370865

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