This Week in Science

In this week's Science, a team led by Johns Hopkins University researchers reports the first synthetic eukaryotic chromosome, which was developed from Saccharomyces cerevisiae. The eukaryote's genome includes 12 million nucleotides, and the scientists focused on yeast chromosome III, which contains more than 2.5 percent of those nucleotides. After using software to amend certain portions of the chromosome, the researchers built a version of it from individual nucleotides.

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