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. 2013 Feb 13;8(2):e56019. doi: 10.1371/journal.pone.0056019

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© 2013 Christensen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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1,25(OH)₂D and PTH influence vitamin D metabolism by positive (+) or negative (−) regulation of the activity of the 1α-hydroxylase and the 24-hydroxylase. 25(OH)D, 25-hydroxyvitamin D; 1,25(OH)₂D, 1,25-dihydroxyvitamin D; 24,25(OH)₂D, 24,25-dihydroxyvitamin D; 1,24,25(OH)₃D, 1,24,25-trihydroxyvitamin D.