4BCS:
reference: A novel chimeric avidin with increased thermal stability using DNA shuffling., Taskinen B, Airenne TT, Janis J, Rahikainen R, Johnson MS, Kulomaa MS, Hytonen VP, PLoS One. 2014 Mar 14;9(3):e92058. doi: 10.1371/journal.pone.0092058. eCollection, 2014. PMID: 24632863

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