1FZF:
reference: Conformational changes in fragments D and double-D from human fibrin(ogen) upon binding the peptide ligand Gly-His-Arg-Pro-amide., Everse SJ, Spraggon G, Veerapandian L, Doolittle RF, Biochemistry 1999 Mar 9;38(10):2941-6. PMID: 10074346

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