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A The LC/MS chromatographs of apigenin-7-O-glucuronide (green), baicalin (blue) and wogonoside (red) in bile and blood matrix. The retention time of each peak was marked in the chromatographs. B The LC/MS chromatographs of blank bile and blood matrix without any spiked analytes. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
