1XKB:
reference: Structural basis for chemical inhibition of human blood coagulation factor Xa., Kamata K, Kawamoto H, Honma T, Iwama T, Kim SH, Proc Natl Acad Sci U S A 1998 Jun 9;95(12):6630-5. PMID: 9618463

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