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(A) Plasma concentrations of 25(OH)-vitamin D and (B) 1,25(OH)2-vitamin D, (C) kidney mRNA expression of the enzymes CYP27b1 and (D) CYP24a1 relative to GAPDH, and (E) plasma concentrations of fibroblast growth factor 23 (FGF23). Student’s t-test between control (black bars) and energy-restricted (grey bars) groups. * p < 0.05 vs. control.
