1CFI:
reference: Structure of the calcium ion-bound gamma-carboxyglutamic acid-rich domain of factor IX., Freedman SJ, Furie BC, Furie B, Baleja JD, Biochemistry 1995 Sep 26;34(38):12126-37. PMID: 7547952

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