Fig. 1From: The relationships of vitamin D, vitamin D receptor gene polymorphisms, and vitamin D supplementation with Parkinson’s diseaseVitamin D metabolism. DBP, Vitamin D-binding protein; RXR, retinoid X receptor; VDREs, vitamin D response elements; VDR, vitamin D receptor; 1-OHase, 25-hydroxyvitamin D-1α- hydroxylase; 24-OHase, 25-hydroxyvitamin D-24-hydroxylaseBack to article page