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The growth of arbors into the cuneate nucleus (arrows) in a macaque monkey 22 mo after transection of the dorsal columns at C3 level. (a) A dark-field photomicrograph of the section through the lower medulla showing B-HRP tracer in the cuneate nucleus from injections of the tracer in the skin of the chin. (b) A bright-field photomicrograph of the adjacent section stained for cytochrome oxidase activity showing location of the label. For details, see Fig. 1. (Scale bar, 500 μm.)
