4DGJ:
reference: Crystal structure of a supercharged variant of the human enteropeptidase light chain., Simeonov P, Zahn M, Strater N, Zuchner T, Proteins. 2012 Apr 10. doi: 10.1002/prot.24084. PMID: 22488687

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