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Expression levels of the significantly changed metabolites. (A) 2-ketovaleric acid; (B) 3,4-dihydroxybenzoic acid; (C) 5-aminovaleric acid; (D) ascorbate; (E) dehydroascorbic acid; (F) inosine; (G) phenylalanine; (H) succinic acid; (I) β-glycerophosphoric acid; (J) maleamate; (K) maleic acid; (L) monoolein; (M) ribose; (N) trans-4-hydroxy-L-proline; (O) ranking of VIP values.
