Updated: October 13, 2010
Stem cells science holds great promise for medical research, possibly providing cures for conditions such as Parkinson's, Alzheimer's, diabetes, heart disease and spinal cord injuries. But critics say using stem cells from embryos, even those newly created in a petri dish, is equivalent to taking human life, since embryos are destroyed when stem cells are removed.
Check out the gallery to see how cells are removed from cloned embryos.
Geron Corp. has begun testing an embryonic stem-cell treatment on a patient with spinal cord injuries, marking the first time such a medical therapy has been used on a human in a government approved study.
Shelby Holiday reports on the stem cell research controversy and challenges after a federal judge has blocked a change in regulations.
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