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CRF in situ hybridization in the paraventricular nucleus of the hypothalamus (A, C, E, G) and median raphe nucleus (B, D, F, H) in four vole species. Note the similarity in brain distribution of CRF mRNA in both brain regions among the prairie voles (A, B), pine voles (C, D), meadow voles (E, F), and montane voles (G, H). Scale bar = 1 mm.
