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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