2UZ2:
reference: Structural and functional characteristics of xenavidin, the first frog avidin from Xenopus tropicalis., Maatta JA, Helppolainen SH, Hytonen VP, Johnson MS, Kulomaa MS, Airenne TT, Nordlund HR, BMC Struct Biol. 2009 Sep 29;9(1):63. PMID: 19788720

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