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D2αPan receptors can be located on presynaptic varicosities and terminal swellings. Electron micrographs showing anti-D2α immunogold staining (arrows) on a vesicle-containing varicosity (A) and a terminal swelling lacking vesicles (B). T-bars and postsynaptic densities indicative of synapses are not observed in these micrographs, suggesting that D2αPan receptors can be extrasynaptic. Scale bar = 0.25 μm in A,B.
