4I8H:
reference: On the reproducibility of protein crystal structures: five atomic resolution structures of trypsin., Liebschner D, Dauter M, Brzuszkiewicz A, Dauter Z, Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1447-62. doi:, 10.1107/S0907444913009050. Epub 2013 Jul 17. PMID: 23897468

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