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  1. Stem cells: What they are and what they do - Mayo Clinic

  2. Stem Cells: Types, What They Are & What They Do - Cleveland Clinic

  3. Stem Cell Basics | STEM Cell Information - National Institutes of Health

  4. How Stem Cells Work - HowStuffWorks

  5. Stem cells: Sources, types, and uses - Medical News Today

  6. Stem cell | Definition, Types, Uses, Research, & Facts

  7. Stem Cell Basics - University of Nebraska Medical Center

  8. Explainer: What is a stem cell? - Science News Explores

  9. Introduction to Stem Cells | STEM Cell Information

  10. Stem cells: highlights from research - Nature