Differentiation of embryonic stem (ES) cells, which are originally totipotent, puts increasing restrictions on the final fates that a cell can achieve. This simple idea was upset last year when neural stem cells were shown to produce blood cells in irradiated adult mice. In the 2 June issue of Science, Clarke et al. show that neural stem cells injected into embryos can generate a wide variety of tissues including cells in the central nervous system, heart, liver, and intestine (Science 2000, 288
| June 7, 2000
Differentiation of embryonic stem (ES) cells, which are originally totipotent, puts increasing restrictions on the final fates that a cell can achieve. This simple idea was upset last year when neural stem cells were shown to produce blood cells in irradiated adult mice. In the 2 June issue of
Scientists find the molecule that delivers itchiness signals to the brain via a dedicated, and previously unknown, neural pathway.
The International Institute for Species Exploration at Arizona State University reveals its list of the top 10 new species of 2012.
The virus is able to transmit between the small mammals, but does not appear to spread readily through human-to-human contact.
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