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How can cloning help in curing diseases?

Therapeutic cloning does not strive to make whole humans. Instead, it makes embryos as a source of embryonic stem cells for therapeutic purposes. Because embryonic stem cells can grow into any body cell, they might be cultured into nerve cells, skin cells, even hair follicles for the bald. The obvious use of therapeutic cloning would be treating deadly diseases like diabetes and Parkinson's, where a specific type of cell has died.