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Paired sections stained for CRF in situ hybridization (A, C), and CRF2 receptor autoradiography (B, D) at the level of the nucleus accumbens in monogamous prairie (A, B), and pine (C, D) voles. Note the presence of CRF mRNA signal in the same vicinity of CRF2 receptor binding. Promiscuous meadow and montane voles lack CRF2 binding in the nucleus accumbens. Scale bar = 1 mm.
