Mammalian 3-oxosteroid delta 5 --delta 4 -isomerase. Solubilization by calcium ions and kinetic characteristics toward C 19  and C 21  steroids.
D015068:17-Ketosteroids; D000311:Adrenal Glands / Q000166:cytology / Q000201:enzymology; D000736:Androstenes; D000818:Animals; D002122:Calcium Chloride; D002417:Cattle; D003956:Dialysis; D006863:Hydrogen-Ion Concentration; D007535:Isomerases / Q000302:isolation & purification* / Q000378:metabolism; D007664:Ketosteroids; D007700:Kinetics; D008861:Microsomes / Q000201:enzymology; D011283:Pregnenes; D011489:Protein Denaturation; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet
D015068:17-Ketosteroids; D000736:Androstenes; D007664:Ketosteroids; D011283:Pregnenes; D007535:Isomerases; D002122:Calcium Chloride