Action of the contact factor on the aggregation of the platelets.
D001778:Blood Coagulation Disorders / Q000503:physiopathology; D005174:Factor XII / Q000494:pharmacology*; D006801:Humans; D010973:Platelet Adhesiveness / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*
D005174:Factor XII