near-significantP = 0.0596
In BLA, opioid-experienced rats showed a near-significant increase in heroin-induced Fos relative to naïve rats (5B; main effect of opioid experience: F (1,25) = 3.893, P = 0.0596; η p 2 = 0.1347), with no main effect of rearing group (Fig. 5B ; F (1,25) = 0.6029, P = 0.4448 ) .