4H6T:
reference: Autoactivation of thrombin precursors., Pozzi N, Chen Z, Zapata F, Niu W, Barranco-Medina S, Pelc LA, Di Cera E, J Biol Chem. 2013 Apr 19;288(16):11601-10. doi: 10.1074/jbc.M113.451542. Epub, 2013 Mar 6. PMID: 23467412

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