2KT2:
reference: NmerA of Tn501 Mercuric Ion Reductase: Structural Modulation of the pKa Values of the Metal Binding Cysteine Thiols., Ledwidge R, Hong B, Doetsch V, Miller SM, Biochemistry. 2010 Sep 9. PMID: 20828160

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