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Photomicrographs of Fos immunoreactivity in the MnPO of OVX + E2 rats exposed to the ambient temperatures of 24 C (A) and 31 C. (B). The MnPO was the only area (of 14 areas examined) that demonstrated significantly increased numbers of Fos-ir cells in response to the higher ambient temperature. 3V, Third ventricle; ac, anterior commissure. Scale bar in A, 50 μm and applies to both A and B.
