Degenerative diseases is defined as diseases not due to infection that result in a progressive decline in some bodily function ; diseases that typically result from long-term wearing out of body organs, typically associated with aging, lifestyle, and environment. Moreover, Degenerative diseases is a group of disorders, such as Alzheimer's disease, Parkinson's disease, and Huntington's chorea which resulted from the degeneration of neurons in the central nervous system. These disorders are characterized by progressive cerebral degeneration and disturbance in several behaviors or functions.

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