| dihydroxycholecalciferols | Cholecalciferols substituted with two hydroxy groups in any position. (12 Dec 1998) |
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| 1a,25-dihydroxycholecalciferol | An active form of vitamin D formed in the proximal convoluted tubules of the kidney. A deficiency of the receptor for 1a,25-dihydroxycholecalciferol results in all of the features of a vitamin D3 deficiency. (05 Mar 2000) |
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