Assertion: l tryptophan | /r/HasProperty | et al.
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text: Likewise, since the 1940s, it was also noted through scientific research on rodents that a lack of vitamin B6 leads to a dysfunctional-abnormal tryptophan metabolism, manifested in an elevated urine level of “xanthurenic acid” (XA), a harmful metabolic degradation product of L-tryptophan (Lepkovsky, et al., 1943; Porter, et al., 1948; Davis, 1965).