4I6E:
reference: SCFFBXL3 ubiquitin ligase targets cryptochromes at their cofactor pocket., Xing W, Busino L, Hinds TR, Marionni ST, Saifee NH, Bush MF, Pagano M, Zheng N, Nature. 2013 Apr 4;496(7443):64-8. doi: 10.1038/nature11964. Epub 2013 Mar 17. PMID: 23503662

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