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

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

  3. Stem Cell Basics | STEM Cell Information

  4. Stem cells: past, present, and future | Stem Cell Research ...

  5. Biology of stem cells: an overview - PMC - PubMed Central (PMC)

  6. Stem cell-based therapy for human diseases | Signal ... - Nature

  7. Stem Cells: Types, What They Are & What They Do