STEM CELL part 3

Stem cell 1

 

Until recently, scientists primarily worked with two kinds of stem cells from animals and humans: embryonic stem cells and non-embryonic “somatic” or “adult” stem cells. Scientists discovered ways to derive embryonic stem cells from early mouse embryos in 1981. The detailed study of the biology of mouse stem cells led to the discovery, in 1998, of  a method to derive stem cells  from human embryos and grow the cells in the laboratory. These cells are called human embryonic stem cells. The embryos used in these studies were created for reproductive purposes through in vitro fertilization procedures. When they were no longer needed for that purpose, they were donated for research with the informed consent of the donor. In 2006, researchers made another breakthrough by identifying conditions that would allow some specialized adult cells to be “reprogrammed” genetically to assume a stem-cell like state. This new type of stem cell, called induced pluripotent stem cells.

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