5JVF:
reference: ATP-Induced Structural Remodeling in the Antiactivator FleN Enables Formation of the Functional Dimeric Form., Chanchal, Banerjee P, Jain D, Structure. 2017 Feb 7;25(2):243-252. doi: 10.1016/j.str.2016.11.022. Epub 2017, Jan 5. PMID: 28065505

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