| calcidiol | 25-hydroxycholecalciferol (a 3,25-diol);the first step in the biological conversion of vitamin D3 to the more active form, calcitriol; it is more potent than vitamin D3. Synonym: 25-hydroxycholecalciferol, calcifediol. Calcidiol 1a-hydroxylase, 25-hydroxycholecalciferol 1a-hydroxylase, the monooxygenase that forms calcitriol from calcidiol using O2 and NADPH; a deficiency in this enzyme can result in features of a vitamin D deficiency. (05 Mar 2000) |
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| calcidiol |
25-hydroxycholecalciferol.
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