Fig. 2From: Protective effect of L-pipecolic acid on constipation in C57BL/6 mice based on gut microbiome and serum metabolomicSerum metabolomic analysis. PLS-DA score plot of serum metabolites for clustering the control and functional constipation group in positive ion and negative ion, respectively (A). OPLS-DA of metabolites in both ion mode from controls and functional constipation (B)Back to article page