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The mean ± SEM time (s) male voles spent investigating odors of (A) OVX+E2, ad lib-fed females compared to those of OVX+E2, FD 12 h females and the odors of (B) OVX+E2, 12 h food-deprived females compared to those of OVX + blank, ad lib-fed females. Significance differences signified by * indicates P <0.05, and ** indicates P < 0.01.
