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Deficiencies of one or more enzymes on the kynurenine pathway leads to an accumulation of intermediate metabolic products which can cause effects depending on their concentration, function and their inter-relation with other metabolic products. For example, kynurenine 3-monooxygenase deficiency is associated with disorders of the brain (such as schizophrenia and tic disorders) and of the liver. The mechanism behind this observation is typically a blockade or bottleneck situation at one or more

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