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A strain of bacteria, typically highly pathogenic, that has been genetically engineered so that it can't survive on anything but a very specialized medium of nutrients; this is done so that geneticists can experiment on certain pathogens without the risk that they will escape from the lab.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

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