Xenogen: Peering into hidden regions

Being able to see what is going on inside test animals would allow researchers to have an immediate analysis of the effects of experimental compounds or treatments. In some cases this is possible, for example with the nematode C. elegans, which is transparent. Unfortunately, other animals keep their internal processes concealed. Xenogen Corp. has developed a system to remove that barrier and permit direct visualization of cells and other biological events within living

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