![]() ![]() ![]() And these are the three different general parts of an organism that happens during its development. There are also embryonic stem cells, and these are derived from three and a half days in the mouse and about six- to eight-day embryos in people, and these are cells with even more potential than the adult cells, because an embryonic stem cell derived in the proper way can give rise to neural cells, muscle cells, and liver cells. And there are many different kinds of stem cells that have been identified in adults. There are stem cells in neural tissue that give rise to neurons and astroglial cells and things like that. There are stem cells in the liver that give rise to hepatocytes and secretory cells. And people have stem cells in their bone marrow that give rise to all the different kinds of blood that they have. These are the ones that live in the adult organism. Now, there are several different kinds of stem cells. So a very small number of stem cells can give rise to an enormous number of mature progeny. And you can see that not only do they mature as they head down the pyramid, but they get greater in number. So generally, if you think about it, stem cell is the top brick in a big pyramid, and at the base of the pyramid are maybe four different kinds of cells that are derived from that stem cell. So stem cells generally are undifferentiated, and then the kind of cells that they make would become the more mature cells that you're familiar with. A stem cell is a specific type of cell in the body that has the potential to form many different cell types. ![]()
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