Mice were treated with antibiotic (AB) mix or vehicle (VEH) by gavage for 11 days. The panels show the expression of neuropeptide Y (NPY) and the NPY receptors NPY1R, NPY2R and NPY5R 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.