Fig. 4From: Protective effect of L-pipecolic acid on constipation in C57BL/6 mice based on gut microbiome and serum metabolomicAssociation of differential gut microbiota with metabolites. The cluster heat map of spearman correlation hierarchical analysis of significant differences in gut microbiota and metabolites. *P < 0.05, * *P < 0.01. Pairs with low correlations (|r| < 0.5)Back to article page