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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: J Steroid Biochem Mol Biol. 2012 Sep 15;136:54–58. doi: 10.1016/j.jsbmb.2012.09.012

Figure 1.

Figure 1

Proposed mechanism that enterohepatic circulation delivers vitamin D derivatives to the intestine and 1α,25(OH)2D3 induces intestinal CYP3A4 expression via VDR-mediated pathway.