title: The assay of Christmas factor (factor IX) in normal and pathological sera.
mesh_terms: D001681:Biological Assay; D001777:Blood Coagulation; D001780:Blood Coagulation Tests; D005164:Factor IX; D006467:Hemophilia A / Q000097:blood*; D006801:Humans; D014842:von Willebrand Diseases
chemical_list: D005164:Factor IX
keywords: BLOOD COAGULATION; HEMOPHILIA/blood