FIG. 1.
The necessity of cofactors for biotransformation in the cell extract. (A to C) Conversion of daidzein to dihydrodaidzein in the cell extract with NADPH (A) or NADH (B) and without a cofactor (C). Elution profiles of the reference standards daidzein, dihydrodaidzein, and equol are shown in the panel labeled STD.