Fig. 4.
TH immunoreactivity in the LC and substantia nigra. A, TH immunoreactivity in the LC of a saline-injected withdrawing rat; B, TH immunoreactivity in the LC of a saporin-injected withdrawing rat; C, TH immunoreactivity in the substantia nigra of a saline-injected withdrawing rat; D, TH immunoreactivity in the substantia nigra of a saporin-injected withdrawing rat. Note the profound reduction of TH immunoreactivity (arrow) in the LC of the saporin-treated rat (B); by contrast TH immunoreactivity in the substantia nigra of the saporin-treated rat (D) was not changed. Scale bar, 250 μm.