MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Illustration showing degeneration of dopaminergic neurons in the substantia nigra of the midbrain. The image at top depicts where the substantia nigra lies in the brain. At bottom right is a normal substantia nigra and at bottom left is a diminished substantia nigra. Degeneration of this structure is characteristic of Parkinson's disease.
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