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Effects of donepezil and TDJW (High, Medium, Low) on learning and memory improvement of AD rats in step-down test (n = 12). The columns represent the mean ± SEM for latency (s) of step-down test (a), and error times of step-down test (b). ** P < 0.01, model versus sham; ▲ P < 0.05, ▲▲ P < 0.01, donepezil or TDJW (high, medium, low) versus model.
