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Stem cells: What they are and what they do - Mayo Clinic
Stem Cells: Types, What They Are & What They Do - Cleveland Clinic
Stem Cell Basics | STEM Cell Information - National Institutes of Health
How Stem Cells Work - HowStuffWorks
Stem cells: Sources, types, and uses - Medical News Today
Stem cell | Definition, Types, Uses, Research, & Facts
Stem Cell Basics - University of Nebraska Medical Center
Explainer: What is a stem cell? - Science News Explores
Introduction to Stem Cells | STEM Cell Information
Stem cells: highlights from research - Nature