Figure 2From: A comparative analysis of the distribution of immunoreactive orexin A and B in the brains of nocturnal and diurnal rodentsParaventricular nucleus. Photomicrographs of orexin A cell bodies in the paraventricular nucleus (Pa) of the Long-Evans rat (A), grass rat (B), and Syrian hamster (C). Note lack of similar cell bodies in the degu (D). 3V: third ventricle. Scale bar = 200 μm.Back to article page