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. Author manuscript; available in PMC: 2010 Feb 2.
Published in final edited form as: Prog Neuropsychopharmacol Biol Psychiatry. 2009 Sep 21;34(1):37. doi: 10.1016/j.pnpbp.2009.09.015

Figure 1.

Figure 1

Possible neurotoxic consequences of kynurenine pathway activation. TRP, tryptophan; IFN, interferon; IL, interleukin; 3-HK, 3-hydroxykynurenine; 3-HAA, 3-hydroxyanthranilic acid; QUIN, quinolinic acid; KA, kynurenic acid; BBB, blood-brain barrier; NMDA-R, N-methyl-D-aspartate receptor; tCho, Total Choline; GABA, γ-aminobutyric acid.