1A2Z:
reference: X-ray structure of pyrrolidone carboxyl peptidase from the hyperthermophilic archaeon Thermococcus litoralis., Singleton M, Isupov M, Littlechild J, Structure Fold Des 1999 Mar 15;7(3):237-44. PMID: 10368293

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