Silicon.
D000375:Aging; D000818:Animals; D001842:Bone and Bones / Q000378:metabolism; D002113:Calcification, Physiologic; D002118:Calcium / Q000378:metabolism; D003094:Collagen / Q000378:metabolism; D003238:Connective Tissue / Q000378:metabolism; D003677:Deficiency Diseases / Q000150:complications; D006025:Glycosaminoglycans / Q000378:metabolism; D006801:Humans; D009751:Nutritional Requirements; D012825:Silicon / Q000172:deficiency / Q000502:physiology*
D006025:Glycosaminoglycans; D003094:Collagen; D002118:Calcium; D012825:Silicon