title: Aging reduces intestinal and skeletal receptors for 1,25-dihydroxyvitamin D.
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D002117:Calcitriol / Q000378:metabolism*; D007422:Intestines / Q000737:chemistry*; D051381:Rats; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid / Q000032:analysis*
chemical_list: D018167:Receptors, Calcitriol; D011987:Receptors, Steroid; D002117:Calcitriol