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Epimerization of the 7α‐OH group of CA and CDCA. In our work, the NADH produced in the first reaction step (oxidation of 7α‐OH) is reused by a NADH‐dependent 7β‐HSDH giving the 7β‐OH epimer. E1 and E2 are two additional enzymes (i.e., alcohol dehydrogenases) used to regenerate the cofactors converting the sacrificial substrates 1 and 2, respectively, into waste products.
