5XOZ:
reference: Structural insights into the unique inhibitory mechanism of Kunitz type trypsin inhibitor from Cicer arietinum L., Bendre AD, Suresh CG, Shanmugam D, Ramasamy S, J Biomol Struct Dyn. 2018 Jul 27:1-38. doi: 10.1080/07391102.2018.1494633. PMID: 30052127

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