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HPLC chromatograms of tocopherol/tocotrienol metabolites in urine samples. A: tocopherol/tocotrienol metabolites in mouse urine samples. B: tocopherol metabolites in enzyme-hydrolyzed and un-hydrolyzed human urine samples collected at 0, 12, 24, and 48 h. C: tocopherol metabolites in pre-dose human urine samples after and before enzymatic hydrolysis shown in a more sensitive scale.
