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Effect of diphenyleneiodonium (DPI) on cholinesterase activities. The inhibitory potency of DPI was determined by incubation of human AChE and BChE with 10−6 to 10−4 M and 10−7 to 10−4 M DPI, respectively, for 5 min before adding substrate to determine enzyme activity. Each point represents the means ± SD of four experiments.
