Changes in the expression of parvalbumin, glutamate decarboxylase1 (GAD1) and the α3 subunit mRNAs in the reticular nucleus of the thalamus. Panels on the left show autoradiographic images of in situ hybridization for parvalbumin, glutamate decarboxylase1 (GAD1) and the α3 subunit mRNAs. Right side panels show relative optic densities (ROD) in the reticular thalamic nucleus (arrows). Note the decreases in all three mRNAs ipsilateral to TBI. Scale bar = 250 μm (a–c, e–g, i–k). Statistical significance: *p < 0.05, ***p < 0.001 as compared to controls. Abbreviations: GAD1, Glutamate decarboxylase1; PV, parvalbumin; RT, reticular nucleus of the thalamus.