title: The in vitro effect of heparin on the activated partial thromboplastin time.
mesh_terms: D001780:Blood Coagulation Tests; D004305:Dose-Response Relationship, Drug; D006493:Heparin / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D006801:Humans; D013925:Thromboplastin / Q000032:analysis*
chemical_list: D006493:Heparin; D013925:Thromboplastin