Concentrations of primary and secondary BAs in the feces of WT and Oatp1a1-null mice.

<p>Feces were collected from WT and Oatp1a1-null mice for 24 hr and dried under vacuum. The concentrations of primary BAs (a, b, and c) and secondary BAs (d, e, and f) in the feces of male WT and Oatp1a1-null mice (n = 5/group) were analyzed using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) and normalized by fecal dry weight. All data are expressed as mean ± S.E. of five mice in each group. *, statistically significant difference between WT and Oatp1a1-null mice (<i>p</i><0.05).