Fig. 1.     Camera lucida drawings from alternate frontal sections stained for dopamine-ß-hydroxylase (DBH)/ChAT (A) and tyrosine hydroxylase (TH)/ChAT (B). Cholinergic cells are represented in red, DBH or TH-positive fibers/terminals in black. DBH or TH is detected with nickel-enhanced diaminobenzidine (NiDAB), and ChAT with diaminobenzidine tetrahydrochloride (DAB) according to the double immunolabeling protocol of Hsu and Soban (1982). CP, caudate putamen; f, fornix; GP, globus pallidus; ox, optic chiasm; sm, stria medullaris.