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(A) Changes in body weight and (B) indole-3-propionic acid (I3P) concentration in plasma in Sprague Dawley rats maintained on either standard laboratory chow (control), tryptophan-high chow (TH) or tryptophan-free chow (TF) for two weeks. * p < 0.05 vs. control; # p < 0.05 vs. TH, † p < 0.05 vs. TF. Means ± SE are presented, circles show individual data points.
