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. Author manuscript; available in PMC: 2013 Aug 23.
Published in final edited form as: Curr Opin Clin Nutr Metab Care. 2012 Nov;15(6):625–634. doi: 10.1097/MCO.0b013e328358fc2b

FIGURE 1.

FIGURE 1

Synthetic pathway of the major vitamin D metabolites. (1) Reaction catalyzed by UVB (290–310 nm). (2) Isomerization reaction catalyzed by heat. (3) Reaction catalyzed by 25-hydroxylase. (4) Reaction catalyzed by renal 1-a-hydroxylase. (5). Reaction catalyzed by tissue 1-a-hydroxylase. 1,25(OH)2D3, 1,25-dihydroxyvitamin D3; 25(OH)D3, 25-hydroxyvitamin D3; DBP, vitamin D-binding protein.