Platelet heparin-neutralizing activity (platelet factor 4).
D000990:Antithrombin III / Q000502:physiology*; D001779:Blood Coagulation Factors / Q000502:physiology*; D006801:Humans; D010978:Platelet Factor 4 / Q000502:physiology*
D001779:Blood Coagulation Factors; D010978:Platelet Factor 4; D000990:Antithrombin III