an Entity references as follows:
In enzymology, a 7alpha-hydroxysteroid dehydrogenase (EC 1.1.1.159) is an enzyme that catalyzes the chemical reaction 3alpha,7alpha,12alpha-trihydroxy-5beta-cholanate + NAD+ 3alpha,12alpha-dihydroxy-7-oxo-5beta-cholanate + NADH + H+ Thus, the two substrates of this enzyme are and NAD+, whereas its 3 products are , NADH, and H+.