Assertion: tryptophan's level | /r/HasProperty | cultured in rich medium
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text: Indole can also be detected in human feces, between 0.25 and 1.1 mM (consistent with the levels that are readily produced by E. coli when cultured in a rich medium), which suggests that intestinal epithelial cells are exposed to indole when the fermented substrate is available for Trp degradation in gut (Bansal et al., 2010).