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Plasma content of tryptophan (TRP), kynurenine (KYN), and kynurenic acid (KYNA) and enzyme activity indicator in female scleroderma patients (SSc) and female controls (HC). Statistical analysis was performed using Bonferroni corrected post hoc test; *** p ≤ 0.001, **** p ≤ 0.0001.
