Fig. 7From: Dietary protocatechuic acid ameliorates inflammation and up-regulates intestinal tight junction proteins by modulating gut microbiota in LPS-challenged pigletsHeatmap of Spearman’s correlation between the gut microbiota and anti-oxidant indicators, inflammatory cytokines, or tight junction proteins. The intensity of the colors represented the degree of association (red, negative correlation; green, positive correlation). Significant correlations were marked by *P < 0.05, **P < 0.01Back to article page