Photomicrographs of the medial prefrontal cortex (mPFC, A), CA3 subfield of the hippocampus (B), basolateral amygdala (BLA, C), and superior colliculus (SC, D) of the four groups of mice.

<p>Number of parvalbumin-immunoreactive neurons was decreased in PDGFR-<b>β</b> KO mice (KO-DW). Scale bar = 100 μm.