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Immunolabeled neurons in the thalamus. This is a photograph of a transverse section through the thalamus 4 d after rabies was injected into the M1 arm area. At the 4 d survival time, first-, second-, and third-order neurons are labeled in subdivisions of the ventrolateral thalamus (VL), whereas labeling in the reticular nucleus of the thalamus (RT) is restricted to second- and third-order neurons. Scale bar, 200 μm.
