Fig. 3From: Single-nucleotide polymorphisms and activities of indoleamine 2,3-dioxygenase isoforms, IDO1 and IDO2, in tuberculosis patientsQuantitative standard curves by chromatographic analysis (LC/ESI–MS/MS). A Serum Trp; (B) Serum Kyn; (C) Serum Kyn/Trp ratio in TB patients and healthy controls. *P < 0.05Back to article page