3EMP:
reference: Cysteine pK(a) values for the bacterial peroxiredoxin AhpC., Nelson KJ, Parsonage D, Hall A, Karplus PA, Poole LB, Biochemistry. 2008 Dec 2;47(48):12860-8. PMID: 18986167

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