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If the person responsible for those attacks grew the spores, experts say water might help lead the way to a killer. University of Utah scientists have measured H2O throughout the U.S. for rare forms of hydrogen and oxygen. They say levels of such isotopes vary widely depending upon location. Helen Kruezer-Martin, a Utah biologist, says spores reflect the isotope ratios of water used in their growth cultures. She was easily able to distinguish between spores grown in several U.S. cities. While the technique won't pinpoint where the 2001 anthrax was produced, it could rule many places out. With the National Academy of Engineering, Randy Atkins, WTOP Radio.