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Dendritic spines in the hippocampus. Photomicrograph of Golgi-impregnated hippocampus (A). Pyramidal cells in the hippocampus (B) possess dendritic spines protrusions on the shaft of the dendrite that represent sites of postsynaptic excitatory input (C). Electron micrograph of a spine synapse (arrow) in hippocampal area CA1 (D).
