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Stem cells have amazing potential. A stem cell does not yet have the programming to become a certain type of tissue and therefore has the possibility of becoming ANY type of tissue. This could literally save the life of someone who is lacking tissue for some reason. However, scientists have not yet learned how to make all cell types from stem cells. A lot of research needs to be done to learn how to make every kind of cell, and this is why stem cell research desperately needs funding. Also, they need to figure out how to best deliver these cells to the body so that they can function.
For the social implications, the embryos for the technology are mostly taken from in vitro fertilization clinics. When a couple uses in vitro fertilization, there are many embryos left over from the procedure that are never used to fertilize the woman. They are still a small ball of cells that do not resemble a baby. These embryos usually remain frozen. There is a new technology available that can gather stem cells from embryos that have essential flaws where they would not even live inside a mother. I do not think the technology would break any more social barriers than this if it were allowed. These cells are sufficient for stem cell research to occur. Therefore, I believe the positives outweigh the negatives in this case. Scientists aren't as heartless as people sometimes think.
Oh, and although the cells may not be quite as good for every purpose, using stem cells not from embryos could even eliminate these ethical concerns.
EDIT: As far as the difference between social and ethical concers, they are not all that different. A social concern is how it will affect people at an individual level. An ethical concern is whether it is okay morally. It shouldn't affect people all that much socially in a negative way. It could help you mother, father, sister, whatever if they needed a replacement of some type of tissue. And it's not like people are going to go around stealing stem cells from you, so I doubt it would affect things negatively. Ethically, the concern is that they are still embryos even if they are frozen.
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