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Electron micrographs through anti-α7 nAChR-immunolabeled synapses. A, B, Synapses showing gold particles at the synaptic membranes (arrowhead), presynaptic vesicles (double arrowhead), and postsynaptic stacked membranous structures resembling spine apparatus (arrows). b, Presynaptic boutons; s, postsynaptic spines. Scale bar:A, B, 200 nm.
