| 1TGN: reference: Structure of bovine trypsinogen at 1.9 A resolution., Kossiakoff AA, Chambers JL, Kay LM, Stroud RM, Biochemistry 1977 Feb 22;16(4):654-64. PMID: 556951 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).