3FD9:
reference: Structural evidence suggests that antiactivator ExsD from Pseudomonas aeruginosa is a DNA binding protein., Bernhards RC, Jing X, Vogelaar NJ, Robinson H, Schubot FD, Protein Sci. 2009 Mar;18(3):503-13. PMID: 19235906

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