title: Some biological aspects of the aging brain.
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism; D000375:Aging; D000544:Alzheimer Disease / Q000503:physiopathology*; D000818:Animals; D001921:Brain / Q000033:anatomy & histology / Q000502:physiology* / Q000648:ultrastructure; D002452:Cell Count; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D003704:Dementia / Q000503:physiopathology*; D003712:Dendrites / Q000502:physiology; D006651:Histocytochemistry; D006801:Humans; D008062:Lipofuscin / Q000378:metabolism; D009474:Neurons / Q000166:cytology
chemical_list: D008062:Lipofuscin; D002795:Choline O-Acetyltransferase; D000110:Acetylcholinesterase