1. Holick MF, McNeill SC, MacLaughlin JA et al: The physiologic implications of the formation of previtamin D3 in skin. Trans Assoc Am Phys 92: 54, 1979
2. Gray, RW, Omdahl JL, Ghazarian JG, DeLuca HF: 25-hydroxycholecalciferol-1-hydroxylase. J Biol Chem 247: 7528, 1972
3. Hughes MR, Haussler MR, Wergedal J, Baylink DJ: Regulation of plasma 1 alpha,25-dihydroxyvitamin D3 by calcium and phosphate. Clin Res 23: 323A, 1975
4. Haussler MR, McCain TA: Basic and clinical concepts related to vitamin D metabolism and action. N Eng J Med 297: 974, 1041, 1977
5. Cantley LK, Russell J, Lettieri D, Sherwood LM: 1,25(OH)2 D-dihydroxyvitamin D3 suppresses parathyroid hormone secretion from bovine parathyroid cells in tissue culture. Endocrinology 117: 2114, 1985