2AGG:
reference: Insights into the serine protease mechanism from atomic resolution structures of trypsin reaction intermediates., Radisky ES, Lee JM, Lu CJ, Koshland DE Jr, Proc Natl Acad Sci U S A. 2006 May 2;103(18):6835-40. Epub 2006 Apr 24. PMID: 16636277

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