A stem cell line is a family of constantly dividing cells, the product of a single group of stem cells. 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 organisms.
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Famous quotes containing the words stem, cell and/or line:
“The melon is growing but its stem is shriveling.”
—Russian popular saying, trans. by Vladimir Ivanovich Shlyakov (1993)
“A cell for prayer, a hall for joy,—
They treated nature as they would.”
—Ralph Waldo Emerson (1803–1882)
“What comes over a man, is it soul or mind
That to no limits and bounds he can stay confined?
You would say his ambition was to extend the reach
Clear to the Arctic of every living kind.
Why is his nature forever so hard to teach
That though there is no fixed line between wrong and right,
There are roughly zones whose laws must be obeyed?”
—Robert Frost (1874–1963)