The thienopyridine ticlopidine selectively prevents the inhibitory effects of ADP but not of adrenaline on cAMP levels raised by stimulation of the adenylate cyclase of human platelets by PGE1 - Gachet, C; Cazenave, J P; Ohlmann, P; Bouloux, C; Defreyn, G; Driot, F; Maffrand, J P (Biochem Pharmacol, 1990)