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Effects of TFA and FEB on gut-derived metabolites. (A–D) Serum levels of DAO, SRR, d-serine, and l-serine in the Normal, Model, TFA, and FEB rat groups. The data are expressed as the mean ± SD. * P < 0.05, ** P < 0.01. TFA, total flavones of Abelmoschus manihot; FEB, febuxostat; DAO, d-amino acid oxidase; SRR, serine racemase; SD, standard deviation.
