1U3A:
reference: Intriguing conformation changes associated with the trans/cis isomerization of a prolyl residue in the active site of the DsbA C33A mutant., Ondo-Mbele E, Vives C, Kone A, Serre L, J Mol Biol 2005 Apr 1;347(3):555-63. PMID: 15755450

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