they can also be found in adults too, but these can't be used to turn into any cell
stem cells are undifferentiated, and so are very useful to scientists
scientists believe that they can use stem cells to cure disorders like brain damage and spinal injuries
adult stem cells, like those found in bone marrow, are already used to cure things like leukaemia and sickle cell anaemia
however, adult stem cells may only be used to treat blood disorders
this is why there is extensive research taking place into embryo stem cells, and how we can use them to cure disorders and medical conditions
this could be a huge break-through, and would save thousands of lives
however, there are ethical problems with it, e.g. some people think it's wrong to kill an embryo for its stem cells, but others would rather save a human life already in existance than an embryo who hasn't yet turned into a foetus
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