GABAergic neurons in the SNpr are spared in PGJ2-treated mice. TH (green, dopaminergic) and glutamic acid decarboxylase (GAD-67) staining (red, GABAergic) immunostaining of SN shows a dose-dependent loss of dopaminergic but not of GABAergic neurons after microinjections with 6.7 μg or 16.7 μg of PGJ2. The ellipse indicates the SNpr. The star indicates the site of injection. Scale bar = 100 μm.