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The levels of AA in control group and CKD group (a) and comparison of the levels of AA among the patients with the different stage of CKD (b). *,**,*** P values respectively < 0.05; < 0.01; < 0.001; (controls vs. others). ^,^^,^^^ P values respectively < 0.05; < 0.01; < 0.001; (severe to end-stage CKD vs. mild to moderate CKD). AA, anthranilic acid; CKD, chronic kidney disease
