Fig. 6
From: Delta opioid receptors affect acoustic features of song during vocal learning in zebra finches
Quantification of DARPP-32-positive neurons in the basal ganglia song control nucleus Area X. Well-labelled DARPP-32-positive cells were present in Area X and LMANshell of both control (a, c) and treated (b, d) birds, respectively. Insets in these figures show DARPP-32-positive neurons at high magnification (Scale bar, 100 μm; for insets, 10 μm). For Fig. 6e and f, bar graphs represent mean values, and error bars represent standard deviation; the scatter plot represents the average number of DARPP-32-positive cells per bird. (e) Administration of the δ-OR antagonist naltrindole for a 10-day period during the sensitive period of learning resulted in a significant increase in the number of DARPP32-positive medium spiny neurons in Area X. (f) Although the number of DARPP32-positive cells were also higher in the LMANshell of treated birds, this difference was not significant