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Fig. 6. Postembedding immunogold electron microscopy images of rat hippocampus CA1 synapses. These images are lower magnification views of the three micrographs used in Fig. 2E. Arrows indicate NADH dehydrogenase subunit 2 (ND2) immunoreactivity in postsynaptic densities (PSDs) and over mitochondria as visualized by secondary antibody conjugated to 10-nm gold particles. pre, presynaptic; mit, mitochondria. (Scale bar is 200 nm.)