The term half maximal effective concentration (EC50) refers to the concentration of a drug, antibody or toxicant which induces a response halfway between the baseline and maximum after some specified exposure time.[1] It is commonly used as a measure of drug's potency (From Wikipedia)
所以，我的理解是：曲线上下平台之间一半处所对应的X轴（药物、抗原等）的浓度
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+1/677
