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

  2. Visual Guide to Human Cells - ALLEN CELL EXPLORER

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

  4. Stem Cells- Definition, Properties, Types, Uses, Challenges

  5. Schematic diagram illustrating the stem cell hierarchy. Embryonic stem ...

  6. What is a stem cell? - Slack - 2018 - WIREs Developmental Biology ...

  7. Real Cell Gallery - University of Utah

  8. Schematic diagram of the stem cell niche showing the stem cells

  9. Stem cell - Wikipedia