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Lateral hypothalamus of 1-week-old rat labeled with orexin-A (arrows) (a) and orexin-B (b) antisera. Sections were counterstained with neutral red in order to visualize nonimmunoreactive cells. The size of the neuronal perikarya is small, and the neurites are not well developed. The granular reaction product is expressed asymmetrically, usually on one side of the nucleus. Scale bars: a 30 μm; b 50 μm
