4KWB:
reference: Structure of signal peptide peptidase A with C-termini bound in the active sites: insights into specificity, self-processing, and regulation., Nam SE, Paetzel M, Biochemistry. 2013 Dec 10;52(49):8811-22. doi: 10.1021/bi4011489. Epub 2013 Nov, 25. PMID: 24228759

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