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This microscope photo provided by the McLean Hospital's Harvard Brain Tissue Resource Center in January 2024 shows cells in the caudate nucleus structure of the brain in a person with Huntington's disease. (McLean Hospital's Harvard Brain Tissue Resource Center/NIH NeuroBioBank via AP)

This microscope photo provided by the McLean Hospital's Harvard Brain Tissue Resource Center in January 2024 shows cells in the caudate nucleus structure of the brain in a person with Huntington's disease. (McLean Hospital's Harvard Brain Tissue Resource Center/NIH NeuroBioBank via AP)

This microscope photo provided by the McLean Hospital's Harvard Brain Tissue Resource Center in January 2024 shows cells in the caudate nucleus structure of the brain in a person with Huntington's disease. (McLean Hospital's Harvard Brain Tissue Resource Center/NIH NeuroBioBank via AP)

This microscope photo provided by the McLean Hospital's Harvard Brain Tissue Resource Center in January 2024 shows cells in the caudate nucleus structure of the brain in a person with Huntington's disease. (McLean Hospital's Harvard Brain Tissue Resource Center/NIH NeuroBioBank via AP)