First, they are unspecialized( or infant cells) cells capable of renewing themselves through cell division like mitosis. Second, under certain conditions, they can be forced to be made into a tissue or organ specific cells with special functions. In some organs, stem cells regularly divide to repair and replace worn out or damaged tissues. For example, when you get a cut or scratch and you see a scab come when it's healing. In other organs, however, stem cells only divide under special conditions. As when a piece of a liver is transplanted and your full liver grows back on it’s own slowly is also an example of stem cell regeneration. Until recently, scientists who were primarily worked in stem cell research only used two kinds of stem cells from animals and humans: embryonic stem cells and non-embryonic "somatic" or "adult" stem
First, they are unspecialized( or infant cells) cells capable of renewing themselves through cell division like mitosis. Second, under certain conditions, they can be forced to be made into a tissue or organ specific cells with special functions. In some organs, stem cells regularly divide to repair and replace worn out or damaged tissues. For example, when you get a cut or scratch and you see a scab come when it's healing. In other organs, however, stem cells only divide under special conditions. As when a piece of a liver is transplanted and your full liver grows back on it’s own slowly is also an example of stem cell regeneration. Until recently, scientists who were primarily worked in stem cell research only used two kinds of stem cells from animals and humans: embryonic stem cells and non-embryonic "somatic" or "adult" stem