Which of the following best classifies the side chain of the amino acid listed below? 
Definitions:
Central Nervous System
The part of the nervous system that consists of the brain and spinal cord, responsible for processing and transmitting information in the body.
Peripheral Nervous System
The section of the nervous system lying outside the brain and spinal cord, which includes nerves that connect the central nervous system to sensory organs, muscles, and glands.
Fetal Nerve Cell Transplants
A medical procedure that involves transplanting nerve cells from a fetus into the brain or spinal cord of a patient to treat neurological disorders.
Parkinson's Disease
A neurodegenerative disorder characterized by tremors, stiffness, slowness of movement, and balance problems, resulting from the loss of dopamine-producing brain cells.
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