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Polyphyllin I (PPI), a natural steroidal saponin originating from rihzome of Paris polyphylla, is a potential anticancer candidate. Previous pharmacokinetics study showed that the oral bioavailability of PPI was very low, which suggested that certain amount of PPI might be metabolized in vivo. However, to date, information regarding the final metabolic fates of PPI is very limited. In this study,...
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