4Z2P:
reference: Hoefavidin: A dimeric bacterial avidin with a C-terminal binding tail., Avraham O, Meir A, Fish A, Bayer EA, Livnah O, J Struct Biol. 2015 Jun 27. pii: S1047-8477(15)30024-1. doi:, 10.1016/j.jsb.2015.06.020. PMID: 26126731

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