3ZHC:
reference: Mechanism of protein kinetic stabilization by engineered disulfide crosslinks., Sanchez-Romero I, Ariza A, Wilson KS, Skjot M, Vind J, De Maria L, Skov LK, Sanchez-Ruiz JM, PLoS One. 2013 Jul 30;8(7):e70013. doi: 10.1371/journal.pone.0070013. Print 2013. PMID: 23936134

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