منابع مشابه
The stem-cell menagerie.
The numbers, types and locations of stem cells in the nervous system have been the subject of much discussion. This review summarizes data on the types of stem cell present at different stages of development and in the adult brain, and the markers suggested to distinguish between the various possibilities that have been reported. We present evidence that more than one class of stem cell is pres...
متن کاملComparing a Menagerie of Models for Estimating Molecular Divergence Times
Estimation of molecular evolutionary divergence times requires models of rate change. These vary with regard to the assumption of what quantity is penalized. The possibilities considered are the rate of evolution, the log of the rate of evolution and the inverse of the rate of evolution. These models also vary with regard to how time affects the expected variance of rate change. Here the altern...
متن کاملMicroglia as a stem cell
Microglia is considered the only cell population of mesodermal origin, which comprises 10% of the cells in brain parenchyma. Recent neural stem cell (NSC) studies demonstrate that the brain has regenerative potential. NSCs do not give rise to microglial cells, however indicating that NSCs alone cannot complete the regenetion of the brain. Although the role of microglia is not fully understood, ...
متن کاملMicroglia as a stem cell
Microglia is considered the only cell population of mesodermal origin, which comprises 10% of the cells in brain parenchyma. Recent neural stem cell (NSC) studies demonstrate that the brain has regenerative potential. NSCs do not give rise to microglial cells, however indicating that NSCs alone cannot complete the regenetion of the brain. Although the role of microglia is not fully understood, ...
متن کاملA Topological Menagerie
One way to formulate this mathematically is to ask for an isotopy to remove the meridian loop m from a rigid wire w embedded in the 3-sphere, as shown in Figure 3a. (The wire represents the boy with his attached string, where the upper loop of the wire is his right hand, while the meridian represents the girl with her string.) Of course this is easy: just slide m along w to a point just below t...
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ژورنال
عنوان ژورنال: Nature
سال: 2020
ISSN: 0028-0836,1476-4687
DOI: 10.1038/d41586-020-02682-x