Anthrax bacteria used in last fall's mail attack at a Florida publisher were definitely derived from the original 1981 Ames strain, according to the National Institute of Allergy and Infectious Diseases, which teamed with the National Science Foundation and other agencies to fund a recently completed analysis. By analyzing variable regions in the genomes of the two strains, researchers at The Institute for Genomic Research (TIGR), Rockville, Md, also determined that the Florida strain was not genetically engineered.
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