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Cover image: Representative microphotographs of cyclin D1 expression in colonic crypts of 295 Apc^1638N/+ mice fed calcium and vitamin D3 for 24 wk. (400× magnification). See the study of tumorigenesis and cell cycle progression by Yang et al. on page 1658 of this issue (J. Nutr. 138: 1658–1663, 2008). Copyright © 2008 American Society for Nutrition.