Fig 2. Sex differences in the percentage of DAPI cells that were immunoreactive for parvalbumin (%PV-ir cells) or were surrounded by perineuronal nets (%PNN cells), in the percentage of PV-ir cells surrounded by PNN (%PV with PNN) and in the percentage of PNN surrounding PV-ir cells (%PNN with PV) in 4 song control nuclei, HVC (used as a proper name), RA (robust nucleus of the arcopallium), Area X of the basal ganglia and LMAN (lateral magnocellular nucleus of the anterior nidopallium).

The figure shows the mean ± SEM of data in males (black bars) and females (open bars). Numbers of data in each case are listed in Table 1. ** = p<0.01, * = p<0.05 and (*) = 0.10<p<0.05.