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Quantification of endogenous bile acids, measured from eight human stool samples of different mass and stabilized in OMNIgene-GUT and Snap frozen at −80 °C. Results are shown in terms of total fecal bile acid concentrations (pmol) per mg stool. Each bar represents the mean value of duplicate measurements per donor. The error bars represent one standard deviation. Paired t-test, p = 0.0029.
