5PTP:
reference: Solvent structure in crystals of trypsin determined by X-ray and neutron diffraction., Finer-Moore JS, Kossiakoff AA, Hurley JH, Earnest T, Stroud RM, Proteins 1992 Mar;12(3):203-22. PMID: 1557349

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