TH and Parkinson disease: Magnified images of TH fluorescence with 4’,6-diamidino-2-phenylindole (DAPI) nuclear counterstaining in right halves of WT and PD brains are shown in the third column of Fig. 2C. Obvious asymmetry was consistently apparent in both Nissl-stained (Fig. 2A) and DA neurons (Fig. 2C) between the left (intact) and right (6-OHDA-lesioned) halves of the brain in the SN of the Sham group versus the WT group.