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Scientists are using stem cells to try and cure cystic fibrosis.

They are trying two methods:

1- using stem cells from cloned embryos

2- converting skin cells from a donor into adult stem cells.

What is the advantage of the second method?

1 ) 

Adult stem cells are less likely to be infected by viruses.

2 ) 

Adult stem cells can form a wider range of tissues.

3 ) 

Embryos will not need to be destroyed.

4 ) 

Stem cells produced from donor skin cells are less likely to be rejected.

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