title: Factor IX activator content of normal and factor XI deficient serum.
mesh_terms: D000818:Animals; D002417:Cattle; D005164:Factor IX / Q000378:metabolism*; D005173:Factor XI Deficiency / Q000097:blood*; D006579:Heterozygote; D006720:Homozygote; D006801:Humans
chemical_list: D005164:Factor IX