A-D: color photomicrographs
illustrating CTb-labeled cells charaeterized hy black punctate labeling
and AADC-(A-C) and ChAT (D)-immunoreactive cells characterized by diffuse light brown
staining. Double-labeled cells are easily distinguished in the nucleus
raphe magnus (A-C) and the pedunculopontine nucleus (D) in the pons. The arrow in A indicates the double-labeled cell shown at a higher magnification
Bars = 50 µm (A) and 25 µm (B-D).
Nomenclature according to Berman 4.