Exploring functional genes' correlation with ()-equol concentration and new daidzein racemase identification.

Unlabelled: With its estrogenic activity, ()-equol plays an important role in maintaining host health and preventing estrogen-related diseases. Exclusive production occurs through the transformation of soy isoflavones by intestinal bacteria, but the reasons for variations in ()-equol production among different individuals and species remain unclear. Here, fecal samples from humans, pigs, chickens, mice, and rats were used as research objects.