Assertion: tryptophan's effect | /r/HasProperty | 47% reduction
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Source sentences:
text: Colonization by Lactobacillus johnsonii in rats also decreases ileum IDO mRNA levels and serum kynurenine concentrations, consistent with the effect of L. johnsonii culture cell-free supernatant in reducing IDO1 activity in HT-29 intestinal epithelial cells (47% reduction) (Freewan et al., 2013; Valladares et al., 2013).