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Kynurenine (KYN) and tryptophan (TRP) concentrations and the KYN/TRP ratio × 10−3 in clinically inactive patients (IA) (n = 12) and high disease activity (HDA) (n = 12). The dotted lines are the reference values in healthy children from previous studies used [24,25,26]. Data are presented as means ± SEM. Significance is described as * p < 0.05 and ** p < 0.01.
