1YFQ:
reference: The 1.1-angstrom structure of the spindle checkpoint protein Bub3p reveals functional regions., Wilson DK, Cerna D, Chew E, J Biol Chem 2005 Apr 8;280(14):13944-51. Epub 2005 Jan 11. PMID: 15644329

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