Assertion: tryptophan's level | /r/HasProperty | johansson
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text: Elevated levels of 3-HK and another neuroactive product of the kynurenine pathway, kynurenic acid (KA or KYNA), have also been found in people with schizophrenia, and the research indicates these substances are also involved in allied psychiatric disorders such as bipolar disorder, previously more often referred to as manic depression (Linderholm, et al., 2007; Erhardt, et al., 2009; Johansson, et al., 2013).