Fig. 5

Effects of germ-free status on the gene expression of neuropeptides implicated in social behaviour. Data are plotted as mean expression (relative to the control group) ± SEM for Pomc, Oxt and Avp (encoding the peptides pro-opiomelanocortin, oxytocin and vasopressin respectively) and all comparisons are with n = 8 per group. Two-sample t-tests have 14 degrees of freedom (df) and asterisks denote P < 0.05