ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Computer artwork depicting division of stem cells. A stem cell is an undifferentiated call that can divide indefinitely in culture. It can differentiate to form specialized cells that have a particular function, for example red blood cells, or it can develop to produce all the cells within an organ. Stem cells, in particular those derived from foetal tissue, are used in genetic research.
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