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Markers of the kynurenine pathway were studied in postmortem frontal cortex obtained from individuals with schizophrenia and controls. Quantitative endpoint RT-PCR was used to measure mRNA transcripts. Of the two enzymes capable of catalyzing the first step in the pathway, tryptophan 2,3-dioxygenase (TDO2) and indoleamine dioxygenase (IDO), the concentration of mRNA for TDO2 was found to be elevated...