The variables that significantly contributed to the separation of Human Milk- and Infant Formula-fed piglets in the two MFAs (MFA1, performed with metabolites alone; MFA2, performed with metabolites plus gut microbiota, intestinal and brain variables). Correlations matrix between ileal, colonic, plasma, liver and brain metabolite concentrations and gut microbiota, intestinal epithelium (genes and phenotypic data) and brain (genes) variables (r and p-values)