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Figure 2: Photomicrographs of nonhuman primate immunostained for tyrosine hydroxylase (TH). Dopaminergic neurons located in the substantia nigra compacta (SNc) project to the caudate (CD) and putamen (PUT). Note the markedly reduced TH immunoreactivity in the substantia nigra and striatum (CD and PUT) in the MPTP-treated monkey (b) compared to control (a).