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Labs seeking sarin chemical signature: 99-125-81
In this image provided by the Department of Energy, chemist Brian Dockendorff works on a mass spectrometer at the Pacific Northwest National Laboratory in Richland, Wash., Wednesday, Sept. 4, 2013. Three simple numbers will prove if sarin was used to gas Syrians last month: 99-125-81. Carlos Fraga, a chemist at the lab who specializes in nerve agent forensics calls those numbers sarin’s fingerprint. Fraga says once chemists see those digits, they know they’ve got sarin. (AP Photo/Carlos Fraga)

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