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Life Is Complicated--Literally, Astrobiologists Say - Scientific American

Extraterrestrial Life -- Is Earth the Standard Model for the Universe?

Extraterrestrial Life -- Is Earth the Standard Model for the Universe?
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Some viruses thwart bacterial defenses with a unique genetic alphabet

Some bacteria-killing viruses spell out their genetic instructions in a different DNA alphabet. More than 40 years ago, scientists in Russia reported that a type of bacteriophage called cyanophage S-2L replaces the DNA building block adenine, commonly known as A, with 2-aminoadenine, designated Z. But no one knew how the phage went from A to Z, or why. Science. The findings have implications for the origins of life on Earth, the search for life on other planets and multiple potential applications in biomedicine, synthetic biology, material sciences and computing, says Farren Isaacs, a molecular and synthetic biologist at Yale University who coauthored a commentary in the same issue of

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