Regional cerebral distribution of σ1 receptor radioligand [125I]E-IA-DM-PE-PIPZE (2.5 μCi, i.v.) in CD-1® mouse brain at 30 min, and inhibitory effects of pretreatments with (−)-cocaine (100 μmol/kg, i.p.) and BD1063 (5.0 μmol/kg, i.v.). *Significantly different from controls (ANOVA, Dunnett’s; P < 0.05). Means ± SEM, n = 3 – 4.