both factor ix and factor ixa were bound to gel filtered platelets in the presence of cacl2 ( 2-20 mm ) and human alpha-thrombin ( 0.06-0.2 units/ml ) with maximal binding occurring in 10-20 min at 37 degrees c , and rapid reversibility was observed when unlabeled ligands were added in 100-fold molar excess .
C0015491
factor ix
C0015494
factor ixa