Heparin and ristocetin-induced platelet aggregation.
D006493:Heparin / Q000494:pharmacology*; D006801:Humans; D010974:Platelet Aggregation / Q000187:drug effects*; D012310:Ristocetin / Q000037:antagonists & inhibitors*
D012310:Ristocetin; D006493:Heparin