By skipping a single missing letter, the drug makes a shorter but effective version of dystrophin.

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He noted that Leahy's name was missing on the letter.

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McClellan said the Iraqi government reported the missing weaponry to the IAEA in a letter dated October 10, and the IAEA informed the U.S. mission in Vienna on October 15.

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Melissa Fleming, spokeswoman for the International Atomic Energy Agency, said the interim Iraqi government reported to the agency several days ago in a letter that the explosives were missing from the Al Qaqaa complex south of Baghdad.

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This result can provide a stunningly detailed view of the genome, but this letter-by-letter approach may also sometimes result in scientists missing the forest for the trees.

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The U.S. government makes 80 million different payments every month, and is only weeks away from missing some of those payments if lawmakers refuse to act, Treasury Secretary Timothy Geithner warned in a letter to congressional leaders Monday.

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