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Length of branch order analysis. The pyramidal cells of the layer III from the prefrontal cortex showed an increase in the dendritic length only at the level of the fourth order (** = P < 0.05) at 12 months old. The medium spiny neurons of the NAcc from 20 months old rats with donepezil showed a decreased in the dendritic length at third branch their corresponding control group (* = P < 0.01).
