4MLF:
reference: Essential role of conformational selection in ligand binding., Vogt AD, Pozzi N, Chen Z, Di Cera E, Biophys Chem. 2013 Sep 25. pii: S0301-4622(13)00170-1. doi:, 10.1016/j.bpc.2013.09.003. PMID: 24113284

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