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Representative chromatograms of the CM fraction sample at h 6 of one of the subjects analyzed for β-carotene. The four chromatograms, from top to bottom, are the absorbance at 452 nm, m/z 576.5 for 13C40-β-carotene stable isotope internal standard, m/z 543.5 +544.5 for deuterium labeled β-carotene, and m/z 536.5 for native β-carotene and lycopene isomers.
