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Efflux of [14C]faropenem from Xenopus oocytes via mouse Npt1. Efflux of preloaded [14C]faropenem was measured in water- or mouse Npt1 cRNA-injected oocytes in chloride ion-free medium. Open and closed bars represent the fractional amounts in oocytes and extracellular medium after 30 min of efflux, respectively.
