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neurons brain neural network synapse neurotransmitters cerebellum axon dendrite cell body nucleus cytoplasm membrane glia astrocytes oligodendrocytes microglia blood-brain barrier cerebrospinal fluid neurogenesis neural plasticity learning memory cognition consciousness intelligence emotion motivation behavior health disease aging neurodegenerative disorders brain injury stroke epilepsy multiple sclerosis Parkinson's disease Alzheimer's disease Huntington's disease prion diseases Creutzfeldt-Jakob disease mad cow disease scrapie kuru fatal familial insomnia