equilibrium dialysis experiments demonstrated that gla-domainless human factor ixa beta retained two high-affinity calcium binding sites ( kd=52 microm ) , a finding essentially identical to that observed for gla-domainless bovine factor ix that contains 0.8-0.9 moles of beta-hydroxyaspartic acid per mole of protein .
C0015494
factor ixa
C0015491
factor ix