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NASA Science

Genome of Controversial Arsenic Bacterium Sequenced 56

Med-trump writes "One year ago a media controversy was ignited when Felisa Wolfe-Simon and her colleagues held a press conference to announce the discovery of a bacterium that not only survived high levels of arsenic in its environment but also seemed to use that element in its DNA. Last week, the genome of the bacterium, known as GFAJ-1, which gets its name from the acronym for 'Give Felisa a Job.' (No joke!), was posted in Genbank, the public repository of DNA sequences for all who care to take a look. But it doesn't settle the debate over whether arsenic is used in DNA."
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Genome of Controversial Arsenic Bacterium Sequenced

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It is easier to change the specification to fit the program than vice versa.