Stem cells lines
A stem cell line is a family of constantly dividing cells, the product of a single parent group of stem cell. They are obtained from human or animal tissues and can replicate for long periods of time in vitro ("within glass", or, commonly, "in the lab"), in an artificial environment). They are frequently used for research relating to embryonic stem cells or cloning entire organism. Once stem cells have been allowed to divide and propogate in a controlled culture, the collection of healthy, dividing, and undifferentiated cells is called a stem cell line.
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