| calcitriol | 1_, 25 dihydroxyvitamin D3. The form of vitamin D3 that is biologically active in intestinal transport and calcium resorption by bone. (18 Nov 1997) |
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| receptors, calcitriol | Proteins, usually found in the cytoplasm, that specifically bind calcitriol, migrate to the nucleus, and regulate transcription of specific segments of DNA. Vitamin d is converted in the liver and kidney to calcitriol and ultimately acts through these receptors. (12 Dec 1998) |