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Electron micrographs of the rat VTA demonstrating immunoperoxidase labeled VAChT-positive axon terminals (VT) forming synapses with asymmetric (white arrow) or symmetric (black arrows) morphology onto unlabeled dendrites (ud). One VT terminal also shows immunogold-silver labeling for GABA (GABA/VT in C), and a GABA-labeled dendrite appears in the adjacent neuropil (GABA-d in B). Scale bar, 0.33 μm.
