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Altered urine preference in male mGluR7 KO mice. (a) Wild-type mice sniffed female urine for a longer duration than their mGluR7 KO littermates. (b) Wild-type mice spent significantly longer duration of sniffing male urine than sniffing saline; no such preference was observed in mGluR7 KO mice. n=8 for (a), n=13 for (b). *P<0.05, **P<0.01. Error bars indicate SEM. See also Supplementary Figure S1.
