Cyp24a1 ddCt data are calculated as Ct normalized to Gapdh and relative to the average of controls. Bars depict mean ± standard error of the mean. *Statistically different from control with 0 pmol dose (P<0.05). **Statistically different between groups (P<0.05). 1,25(OH)2D, 1,25-dihydroxyvitamin D3; β-G-1,25(OH)2D, β-glucuronic-1,25-dihydroxyvitamin D3; Cyp24a1, cytochrome P450 family 24 subfamily A member 1; Gapdh, glyceraldehyde-3-phosphate dehydrogenase.