trending towards significancep = 0.089
In contrast with the previous reports (Banna et al., 2010 ), we show that yohimbine, a pharmacological stressor with high affinity for the α 2 -adrenergic receptor that induces noradrenergic tone, did not reinstate heroin seeking in rats with the previous history of stress although the grouped effect was trending towards significance ( p = 0.089).