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What Are Stem Cells? - Stanford Children's Health

https://www.stanfordchildrens.org/en/topic/default?id=what-are-stem-cells-160-38
What Are Stem Cells? - Stanford Children's Health

What is a stem cell? | Facts | yourgenome.org

https://www.yourgenome.org/facts/what-is-a-stem-cell
What is a stem cell? | Facts | yourgenome.org

Stem Cells - MedlinePlus

https://medlineplus.gov/stemcells.html
Stem Cells - MedlinePlus
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