Figure 3.

Mean (±SEM) Olfactory Preference Index of testosterone-treated WT and GPR54 KO males and females. Positive values of the Preference Index reflect an olfactory preference for stimulus females; negative values reflect a preference for stimulus males. No preference for either sex would produce a Preference Index of 0. Testosterone-treated WT males had a higher Preference Index than all of the other testosterone-treated groups; the Preference Indices of testosterone-treated WT females, KO females, and KO males did not differ from each other. *p < 0.05, significantly different from all other groups.