Fig. 7
From: Urinary kynurenine,tryptophan, and neopterin concentrations during physiological pregnancy

Stability of kynurenine and tryptophan in urine at different storage conditions.
From: Urinary kynurenine,tryptophan, and neopterin concentrations during physiological pregnancy
Stability of kynurenine and tryptophan in urine at different storage conditions.