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Photomicrographs comparing the density of thorny excrescences on apical dendrites of pyramidal cells from a control and an experimental rat. A shows the proximal apical dendrites of a neuron from a control rat. Selected thorny excrescences are denoted by the arrows. B shows the proximal apical dendrites of a pyramidal cell from an experimental rat. Dendrites are devoid of thorny excrescences. Scale bars:A, 20 μm; B, 20 μm.
