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BCO2 cleaves lutein from both the β and ϵ ring side at both the 9,10 and 9′,10′ double bonds. A, schematic of BCO2 oxidative cleavage of lutein showing four of the possible five products. Rosafluene is not depicted. B, HPLC chromatograms of lipid extracts of in vitro enzyme activity assays of MuBCO2 (dashed trace) and trMaBCO2 (gray trace) on lutein (L). The black trace shows the control. C, UV spectra of ϵ-10Apo, 10Apo, and lutein. mAU, milli-absorbance units.
