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

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

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

  4. Stem cell | Definition, Types, Uses, Research, & Facts | Britannica

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

  6. Stem Cell Basics - University of Nebraska Medical Center

  7. Stem Cell - National Human Genome Research Institute

  8. Introduction to Stem Cells | STEM Cell Information

  9. What Are Stem Cells? – Biomedical Beat Blog – National Institute …

  10. Stem Cells - MedlinePlus

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