ipz399中文在线剧情介绍:

In the decades that followed many more tissue-specific adult stem cells have been identified. These stem cells are all capable of division and differentiation into the component cell types of their respective tissue. The observed growth of new neurons in rats has suggested the existence of stem cells in the adult brain. This interesting observation was contrary to previous ideas that brain cells lasted a lifetime. Since then, stem cells have been demonstrated in the brains of adult mice, songbirds, and primates including humans. The growth of new neuronal cells (known as neurogenesis) is restricted to two locations in the brain. Neuronal stem cells can be grown in the laboratory as floating cell aggregates (neurospheres) that contain a large number of stem cells. By changing the culture conditions, they can be differentiated into both neurons (electrically excitable cells that process and transmit information) and glia (cells that feed and protect the brain’s neurons).