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Representative micrographs of the LH. (a) Dually immunolabeled neurons (arrows) with an amber nucleus (Fos-immunoreactive cell) surrounded by blue cytoplasm (orexin-immunoreactive neuron) after AMPH treatment. (b) Orexin-immunoreactive neuron (singly labeled) after vehicle treatment. Scale bar: a (also valid for b), 25 μm.
