4DRX:
reference: A designed ankyrin repeat protein selected to bind to tubulin caps the microtubule plus end., Pecqueur L, Duellberg C, Dreier B, Jiang Q, Wang C, Pluckthun A, Surrey T, Gigant B, Knossow M, Proc Natl Acad Sci U S A. 2012 Jul 24;109(30):12011-6. Epub 2012 Jul 9. PMID: 22778434

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