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This Week in Science

In Science this week, a multi-institute team reports new DNA- and RNA-like systems engineered using eight nucleotide building blocks — dubbed hachimoji — that form orthogonal pairs. According to the scientists, the synthetic systems meet the structural requirements needed to support Darwinian evolution and offer increased informational density over standard DNA.

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The Washington Post reports that the US Department of Agriculture told its researchers to label peer-reviewed articles as "preliminary" work.

Australia will not be regulating gene editing of plants, animals, and human cell lines as long as no new genetic material is incorporated, reports Nature News.

Researchers have sequenced the genomes of both the coast redwood and the giant sequoia, according to the San Francisco Chronicle.

In PNAS this week: study of epigenetic patterns in mammalian eggs, clonal expansion patterns in CD8+ T cells, and more.