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The ratio of total dendritic length varied as a function of bird age. (A) Mean (±SEM) ratio of HVC-RA:LMAN-RA soma size. Average ratio of HVC-RA:LMAN-RA soma size did not vary significantly between the 3- (black bars), 6- (grey bars) and 12-month-old (white bars) individuals. (B) Mean (±SEM) ratio of HVC-RA:LMAN-RA total dendritic length. Average ratio of HVC-RA:LMAN-RA total dendritic length was significantly larger in 12-month-old birds compared to 3-month-old individuals (p= 0.05).
