Effect of L. rhamnosus (JB-1) administration on central GABAB1b mRNA expression. Mice fed with L. rhamnosus (JB-1) (n = 6) had higher levels of GABAB1b mRNA in the cingulate 1 (CG1) (A) and prelimbic (PrL) (B) cortices in comparison with broth fed control mice (n = 6). However, no differences between the two groups were observed in the infralimbic (IL) cortex (C). On the other hand, L. rhamnosus (JB-1) fed animals showed reduced levels of GABAB1b mRNA in the basolateral amygdala (BLA) (D), central amygdala (CeA) (E), locus coeruleus (LC) (F), dentate gyrus (DG) (G), cornus ammonis region 3 (CA3) (H), and cornus ammonis region 1 (CA1) (I) in comparison with broth fed mice. Values represent pixel density (*P < 0.05; **P < 0.01; ***P < 0.001).