Assertion: supplemental tryptophan | /r/HasProperty | tainted with impurity
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Source sentences:
text: One of the contaminants in particular, known as peak E or EBT, seemed to be strongly associated with the harm caused by supplemental tryptophan tainted with impurities because this L-tryptophan toxicant (an analog of the amino acid) notably promotes inflammation and fibrosis which are prominent features of the EMS syndrome (Silver, et al., 1994; Takagi, et al., 1995; Zangrilli, et al., 1995; Buss, et al., 1996; Saito & Miyamoto, 1996).