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The kynurenine/tryptophan (Kyn/Tryp) ratio in the serum of healthy subjects (Ctrl), recovered hepatitis C virus (HCV) [HCV polymerase chain reaction (PCR)–] and chronic (HCV PCR+) HCV patients. Results are shown as median values and interquartile range. Significant difference is shown as *P < 0·05; **P < 0·01.
