[Retracted] Microbiome-Metabolomics Reveals Endogenous Alterations of Energy Metabolism by the Dushen Tang to Attenuate D-Galactose-Induced Memory Impairment in Rats

Figure 4

Principal component analysis (PCA) score plot of all the samples (○) highlighting the quality control (QC) (■) samples in the (a) positive and (b) negative ion modes.

(a)

(b)