title: THE AGING OF COLLAGEN IN THE HEART MUSCLE.
mesh_terms: D000375:Aging; D003094:Collagen; D006651:Histocytochemistry; D006909:Hydroxyproline; D009206:Myocardium; D051381:Rats; D012106:Research
chemical_list: D003094:Collagen; D006909:Hydroxyproline
keywords: AGING; EXPERIMENTAL LAB STUDY; HISTOCYTOCHEMISTRY; HYDROXYPROLINE; MYOCARDIUM; RATS