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AhR activation of (a) ascending, (b) transverse, and (c) descending colon, where each data point represents the AhR activity at each day of the control, tryptophan supplementation, and wash-out period. Measured with the CALUX reporter assay, expressed as percent of the positive control (β-naphthoflavone, 5 μM) using luciferase production as readout. Data are expressed as the mean of 2 donors ± SEM.
