title: Changes in cartilage proteoglycan structure during ageing: origin and effects--a review.
mesh_terms: D000375:Aging; D000818:Animals; D002356:Cartilage / Q000648:ultrastructure*; D002358:Cartilage, Articular / Q000648:ultrastructure; D005109:Extracellular Matrix / Q000648:ultrastructure; D006801:Humans; D011509:Proteoglycans / Q000502:physiology*
chemical_list: D011509:Proteoglycans