4MAB:
reference: Substrate-ready Conformation of Wild Type Salmonella typhimurium AhpC and the Sensitive Balance between Fully Folded and Locally Unfolded Conformations., Perkins A, Nelson KJ, Williams JR, Parsonage D, Poole LB, Karplus PA, Biochemistry. 2013 Oct 31. PMID: 24175952

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