title: Biochemical and morphological changes in the aging brain.
mesh_terms: D000368:Aged; D000375:Aging / Q000378:metabolism / Q000473:pathology*; D000818:Animals; D001921:Brain / Q000378:metabolism / Q000473:pathology*; D003704:Dementia / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D009479:Neuropeptides / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000378:metabolism*; D010300:Parkinson Disease / Q000378:metabolism / Q000473:pathology*
chemical_list: D009479:Neuropeptides; D018377:Neurotransmitter Agents