Fig. 8.
Electron micrographs illustrating D1in the axons of interneurons. A, Profile of the axon terminal of an interneuron, containing parvalbumin (gold particles) and synaptic vesicles (open arrow), which is making a symmetric synapse onto an unlabeled profile (arrowhead). D1-LIR is also seen in the terminal associated with the plasma membrane (arrow). Above the double-labeled axon terminal is a single-labeled PV+ profile for comparison.B, Axonal profile that is labeled with parvalbumin and contains synaptic vesicles (open arrow). D1-LIR is present in the profile as well as in a nearby dendritic spine (arrows). Scale bar, 400 nm.