Therapeutic cloning is a method through which stem cells are created, but used only for repairing damaged tissues in the parent clone cell. These stem cells can be used to grow alternate varieties of organs such as heart, liver and kidney, which can be transplanted as an exact match. This method can create stem cells which could produce sound nerve cells for patients suffering from Parkinson's or Alzheimer's disease.
The person in search of healthy stem cells will have to offer a non-sperm and non-egg cell, from which the DNA would be taken out. This DNA will contain two replicates of each human chromosome. It will then be introduced into a donor egg, which would have its DNA and nucleus already removed. This process is known as somatic cell nuclear transfer. The newly inserted egg would now behave like it has just been fertilized, and would start to divide to form an embryo. It is from this embryo that stem cells would be taken out and refined to generate the required healthy tissue. Read more in detail on embryonic stem cell research.
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