Table 4 Correlations between TRP (Tryptophan), KYN (Kynurenine), IDO (indoleamine 2,3 dioxygenase) activity, QUIN (Quinolinic acid), KYNA (Kynurenic acid), QUIN/KYNA serum levels and neuronal death, microglia/macrophages infiltration, and white matter density. Ipsi, ipsilateral; Hip, hippocampus; Contra, contralateral; MBP, Myelin Basic Protein (P < 0.05 in green, P < 0.01 in yellow, P < 0.001 in orange, P < 0.0001 in red; not significant uncolored)

From: Increased serum QUIN/KYNA is a reliable biomarker of post-stroke cognitive decline