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Dependence of the fraction Nred = [NADPH]/([NADPH] + [NADP+]) on the fluorescence ratio Fex-340/Fex-380. The dependence has been calculated from Equation 6 for the two different values, 5.1 and 15.7, of the ratio QYR of the quantum yield of retinol over that of retinal. Fex-340 and Fex-380 are the fluorescence intensities excited by 340- and 380-nm light, respectively (emission, >420 nm).
