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Year in Science: Amphipolis Mysteries and Other Riddles Revealed - NBCNews.com

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NBCNews.comYear in Science: Amphipolis Mysteries and Other Riddles RevealedNBCNews.comDNA alphabet gets more letters: The genetic code in our DNA is built up using four chemical "letters" — adenine, thymine, guanine and cytosine (A, T, G and C) — but this year, scientists added two more letters (X and Y) to the alphabet in a ...

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