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5′-二磷酸腺普（ADP）引起人的血小板聚集，但血小板与ADP的反应方式尚不明确。在激活血小板过程中，细胞内Ca2＋浓度的增为。起重要作用。ADP是怎样引起Ca2＋浓度增加，以及它用什么样的信号传导机制，尚不清楚。也不清楚ADP发挥作用是与血小板上ADP的一个受体还是多个受体的相互作用结果。本文叙述了一些有关资料，得出了一些人的血小板上ADP受体的数量与性质的试验性结论。
5 ’diphosphate adenine (ADP) caused by human platelet aggregation, but the way of platelet reaction with ADP is not clear. During platelet activation, intracellular Ca2 + concentration increased. makes an important impact. How ADP causes an increase in Ca2 + concentration and what signaling mechanism it uses is not clear. It is unclear whether ADP plays a role as an interaction with one or more ADP receptors on platelets. This article describes some of the relevant data and leads to some experimental conclusions about the number and nature of ADP receptors on human platelets.