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Adenosine 5 -(1-thiotriphosphate) (ATPαS) binds to about 25 000 high affinity sites in platelets (K d 3 nM), competes fully in inhibiting the binding of ADP and, despite the absence of a specific photoactivatable substituent, is directly photoincorporated into a specific 18 kDa domain beginning at Tyr-198 in the α chain of glycoprotein IIb (GPIIbα) following ultraviolet irradiation of fresh...