(A-C) Volume of song control nuclei (mm2), (D-F) total number of PNN/nucleus, (G-I) total number of PV/nucleus and (J-L) total number of PV+PNN/nucleus in HVC, RA and Area X of control (light grey) and T-treated (black) female canaries. Results of the 2-Way ANOVA of these data are summarized in the inserts. Significant interactions were further analyzed by Tukey post-hoc tests whose results are indicated as follows: (*)
p<0.10, * p<0.05, ** p<0.01, *** p<0.001 by comparison with the control group at the same time point.