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Effect of metformin/donepezil combination and metformin only on brain butyrylcholinesterase activity in diabetic rats. Values are expressed as mean ± standard deviation of five determinations. *p < 0.05 vs. normal control, #p < 0.05 vs. diabetic control. Bars with different alphabets are significantly different. Met = Metformin, Don = Donepezil
