Fig. 5.     A DBH-positive terminal contacts a cholinergic dendrite. A: Diagramatic reconstruction of a cholinergic neuron from the substantia innominata, receiving several varicosities (small arrows) all of which confirmed as synapses by electron microscopy. Large arrow in lower left points to the DBH-bouton shown in B. B: The dendrite of the cholinergic neuron identified by the flocculent DAB immunoprecipitate is contacted by a DBH terminal containing the heavy NiDAB deposit. Double labeling according to Hsu and Soban (l982). Arrowheads denote the postsynaptic thickening. Scale: 1 µm.