“…In addition to the inhibition of the cyclooxygenase system, aspirin and aspirin-like drugs will inhibit a variety of other enzymes (Smith & Dawkins, 1971; Paulus & Whitehouse, 1973;Piper & Vane, 1979;Vargaftig, 1978;Morley, 1978). However, the evidence indicates that many of the effects of this class of drugs on platelet function can be explained by their ability to block prostaglandin synthesis and thus block the second phase of platelet aggregation observed in the in vitro system (Smith & Willis, 1971).…”