title: An hypothesis for the action of vitamin D on bone.
mesh_terms: D000818:Animals; D001692:Biological Transport; D001842:Bone and Bones / Q000378:metabolism*; D002113:Calcification, Physiologic; D002118:Calcium / Q000378:metabolism*; D002127:Calcium Isotopes; D002645:Chickens; D002762:Cholecalciferol / Q000627:therapeutic use; D004872:Ergocalciferols / Q000627:therapeutic use; D007408:Intestinal Absorption; D051381:Rats; D012279:Rickets / Q000188:drug therapy; D014807:Vitamin D / Q000494:pharmacology*; D014808:Vitamin D Deficiency / Q000209:etiology*
chemical_list: D002127:Calcium Isotopes; D004872:Ergocalciferols; D014807:Vitamin D; D002762:Cholecalciferol; D002118:Calcium