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How are embryonic stem cells harvested?
Information from the University of Utah about the nature of stem cells, the creation of, types, therapies, potential, research and the debate.
This animated video is from the Khan Academy. Watch the first five minutes to gain an understanding of the role of stem cells.
(Picture credit: http://www.eurostemcell.org/stem-cell-factsheets)
New stem cell technique bypasses ethical concerns
One of the main reasons, stem cell and cloning research is controversial is that such research, particularly stem cells used for therapeutic purposes, requires harvesting unfertilised eggs from human females, which brings with it a lot of ethical problems.