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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
细胞表面上的受体有着三维结构，可与特定物质，如药物、激素、神经递质相结合，这些物质须具备与受体完全适合的三维结构，就像钥匙和锁的关系。
