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Human neurons grown in the brains of mice

Researchers in San Diego have designed mice containing fully functional human nerve cells as a novel way to study and potentially treat neurodegenerative diseases such as Parkinson's and Alzheimer's. //

In the Salk Institute for Biological Sciences in La Jolla, the neurons were formed in the brains of mice that had been injected with human embryonic stem cells as 2-week-old embryos.

Studies showed that the human stem cells migrated throughout the mouse brain and took on the traits of their mouse-cell neighbors. The results present direct evidence that primitive human stem cells can be cultured in the lab, be injected into an animal, and then develop into the type of cell desired.

The report appears in this week's Proceedings of the National Academy of Sciences.

Scientists say this is the first time cultured human embryonic stem cells have been shown to develop into a particular type of cell in the body of another living species.

Days are still far off when this "mouse-human chimeric nervous system" can spawn a mouse with a human-like cerebral cortex. In fact, all the brain structures of the four mice used in the experiments had been formed before the human cells were injected. What is more, less than 0.1 percent of the mice brain cells were found to be of human origin.

Yet the new experiments approach an ethical divide that could make unsettle observers.

The term chimera refers to a Greek mythological creature with the head of a lion and the body of a goat. Such monstrous connotations are tamed in the modern era of pig valves for heart patients and protein drugs manufactured in hamster cells.

Still, some critics of human embryonic stem cell research argue that more attention should be paid to the ethics and potential dangers of cutting-edge biomedical research.

However, the findings are significant in the stem cell field because they suggest that stem cells respond to m
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