4ZUA:
reference: Structural Analysis of the Regulatory Domain of ExsA, a Key Transcriptional Regulator of the Type Three Secretion System in Pseudomonas aeruginosa., Shrestha M, Xiao Y, Robinson H, Schubot FD, PLoS One. 2015 Aug 28;10(8):e0136533. doi: 10.1371/journal.pone.0136533., eCollection 2015. PMID: 26317977

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