From a book called Fundamentals of the Stem Cells Debates by Kristen Renwick Monroe, Ronald B. Miller, and Jerome S. Tobis, I learned that stem cells are unspecified cells that are found in the embryos and the later life stage of an animal, including humans. Stem cells can pretty much renew themselves while being unspecified. Biologists today are developing more rigorous and convenient methods to identify them. In the mammalian embryo, following fertilization of the eggs by a sperm. Several cell divisions take place without any growth in total volume so the cells can get progressively smaller. Scientist believes that an adult stem cell is more specified than embryonic stem cell.
Things I would like to know after reading this article:
Why is the adult stem cell more specified than embryonic stem cell ?
How can stem cell renew themselves quickly?
What are unspecified stem cells ?
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