Risks/Issues: Could transfer viruses to patients, Transferred stem cells could divide uncontrollably (tumours), Low numbers of donors (stem cells/eggs), Rejection of cells (from donors), New technique - limited clinical trial data, Benefits: Can replace damaged or diseased cells., May cure currently untreatable conditions., Reduces the need for organ donors., Social Issues: Treatments could be expensive so not accessible to all, Ethical Issues: Embryos (potential human lives) are destroyed ,

Using Stem Cells

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