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Such therapeutic cloning might be used to create stem cells from people with specific diseases.
The modified eggs will be used to create stem cells which in turn will be grown into muscle, brain and heart cells to see if they function properly.
The embryos used to create stem cells were donated to research by couples who had had the embryos created in fertility centers but no longer needed them.
But M. leprae is hundreds of times larger than a virus, and alters the genetics of the host cell without entering the nucleus, so could potentially be used to create stem cells without causing mutations.
The promise of cloning is that it could be used to create stem cells that are essentially the patient's own.
In the past, some proponents of stem-cell research have retreated to the argument that the embryos used to create stem cells would have been discarded anyway.
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Clearly, federal money cannot be used to create stem-cell lines if embryos are destroyed in the process.
For years, private financing has been used to create embryonic stem cell lines, mostly from discarded embryos from fertility clinics.
A federal law that Obama cannot overturn with an executive order currently prohibits federal dollars from being used to create new stem cell lines, for example.
The crucial test is whether the embryos used to create the stem cell lines were created for reproductive purposes, and whether donors freely consented for their use in research procedures, Dr. Kington said.
Cloning could also be used to create human stem cells genetically compatible with a particular person for use in medical treatment, a process called therapeutic cloning that is now at the center of a bitter ethics debate.
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