Fig. 2.

TH-i cells in the striatum of a control monkey (A) and an MPTP-treated monkey (B). Note the increase in TH-i cell density in the dopamine-depleted striatum (B). Because of the presence of intact nigrostriatal dopaminergic fibers, the neuropil in the control striatum (A) is more intensely stained than in the dopamine-denervated striatum (B). Nevertheless, TH-i cells are easily discerned in control tissue (A). All the TH-i cells in this field are indicated by arrows (A). Scale bar, 100 μm.