Figure 19From: A comparative analysis of the distribution of immunoreactive orexin A and B in the brains of nocturnal and diurnal rodentsLocus coeruleus. Photomidcrographs of orexin A fibers in the locus coeruleus (LC) of the Long-Evans rat (A), grass rat (B), Syrian hamster (C), and degu (D). 4V: fourth ventricle. Scale bar = 200 μm.Back to article page