| ketosteroid | <biochemistry> A steroid-like chemical which is a by-product of the breakdown of certain steroids. They are found in urine and measuring them can give a good indication of the level of androgen production in the body. The major ketosteroids are: androsterone, etiocholanone and oestrone. (09 Oct 1997) |
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| ketosteroids | Steroid derivatives formed by oxidation of a methyl group on the side chain or a methylene group in the ring skeleton to form a ketone. (12 Dec 1998) |
| 3 beta-hydroxysteroid oxidoreductase-delta(5) 3-ketosteroid isomerase | <chemical> System found in breast cancers; consists of EC 1.1.1.145 (progesterone reductase) and EC 5.3.3.1 (steroid delta-isomerase)) Synonym: 3 ohsteroid dehydrogenase-isomerase, delta 5-3 beta hydroxysteroid dehydrogenase-isomerase, 3 beta-hydroxysteroid dehydrogenase-isomerase, 3 beta-hydroxysteroid dehydrogenase-delta(5)-delta(4)-isomerase, 3 beta-hydroxysteroid dehydrogenase-5--4-ene-isomerase, 3-beta-hydroxysteroid dehydrogenase-delta(5-4)-isomerase, 3 beta hydroxysteroid dehydrogenase-delta5-delta4-isomerasease, 3 beta-ol dehydrogenase-delta(4)-delta(5) isomerase, 3 beta-hydroxy-5-ene steroid dehydrogenase-delta 5-delta 4 isomerase (26 Jun 1999) |
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| 3-ketosteroid reductase | <enzyme> Converts 3-keto-4-methyl steroid intermediate of cholesterol biosynthesis to 3-oh; NADPH-dependent Registry number: EC 1.1.1.- (26 Jun 1999) |