The number of TH- and GFAP-positive cells in the substantia nigra was estimated using a random sampling stereological counting method. Images were sampled from at least four different points within each substantia nigra section [37 (link)]. TH (ab6211), GFAP (ab7260), and DAPI (ab104139) were from Abcam, USA. All immunoreactive cells were counted regardless of the intensity of labeling. The slides were photographed with a fluorescence microscope (Nikon, Japan).
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