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The kynurenine pathway of tryptophan degradation generates several neuroactive compounds. Of those, kynurenic acid is an N-methyl-d-aspartate (NMDA) and alpha7 nicotinic receptor antagonist. The kynurenic acid hypothesis of schizophrenia is built upon the fact that kynurenic acid blocks glutamate receptors and is elevated in schizophrenia. Kynurenic acid tightly controls glutamatergic and dopaminergic...
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