What is a stem cell?
A stem cell can renew itself and, under suitable conditions, differentiate into particular other cell types.
How it works and what the evidence shows
Core idea Division can produce more stem cells or descendants that become specialized. Different classes of stem cells do not all generate the same range of cell types. Evidence and research Researchers study development, tissue renewal and disease using these cells. Understanding the conditions that guide differentiation is essential.
Uses and limitations
Why it matters Some cell-based uses are established, while many new approaches need separate safety and effectiveness assessment. Uncontrolled growth, unwanted differentiation and immune reactions are possible concerns. Common misunderstandings Not every stem cell can become every organ. Embryonic, adult and reprogrammed cells have different potentials and limits.