4CB0:
reference: Segmental helical motions and dynamical asymmetry modulate histidine kinase autophosphorylation., Mechaly AE, Sassoon N, Betton JM, Alzari PM, PLoS Biol. 2014 Jan 28;12(1):e1001776. doi: 10.1371/journal.pbio.1001776., eCollection 2014 Jan. PMID: 24492262

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