Shirasawa E, Takeshita M, Yoneyama Y
Experientia. 1980 Oct 15;36(10):1159-60. doi: 10.1007/BF01976098.
20 alpha-hydroxysteroid dehydrogenase was found in the supernatant after hemolysis of human erythrocytes, and the enzyme was isolated from the membrane-free hemolysate on a DEAE-cellulose column. The NADPH-generating system was essential for the reaction.