Mice were treated with antibiotic (AB) mix or vehicle (VEH) by gavage for 11 days. The panels show the expression of brain-derived neurotrophic factor (BDNF), N-methyl-D-aspartate receptor subunit 2B (GRIN2B) and serotonin transporter (SLC6A4) mRNA in the medial prefrontal cortex (A), hippocampus (B), amygdala (C), and hypothalamus (D). mRNA expression is expressed as fold change relative to VEH-treated mice. Values represent means + SEM, n=10-12; *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001 compared to VEH-treated mice, t-test.