Several clinical case studies have found that Parkinson's patients improve following transplants of __________ cells,but the treatment remains controversial.

Question

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Clinical case studies have found that Parkinson's patients have improved after transplants of fetal substantia nigra cells because the substantia nigra is the part of the brain that degenerates in Parkinson's disease. However, the treatment remains controversial due to ethical concerns surrounding the use of fetal tissue.

Several Clinical Case Studies Have Found That Parkinson's Patients Improve