6FT5:
reference: Ligand-induced conformational switch in an artificial bidomain protein scaffold., Leger C, Di Meo T, Aumont-Nicaise M, Velours C, Durand D, Li de la Sierra-Gallay I, van Tilbeurgh H, Hildebrandt N, Desmadril M, Urvoas A, Valerio-Lepiniec M, Minard P, Sci Rep. 2019 Feb 4;9(1):1178. doi: 10.1038/s41598-018-37256-5. PMID: 30718544

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