This Week in Nature

In this week's Nature, a Harvard University-led team reports that a modified version of the gene-editing technology CRISPR can target and modify single nucleotides without introducing random insertions and deletions into the genome. The approach involves a version of the Cas9 protein that does not cut both strands of DNA, but can still bind to a target sequence.

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Technology Review reports that researchers in the US have used CRISPR to modify a number of human embryos.

By introducing genes from butterfly peas and Canterbury bells, researchers in Japan have developed a blue chrysanthemum, according to NPR.

Plant researchers plan to sequence some 10,000 samples that represent the major plant clades, ScienceInsider reports.

In Nature this week: a Danish reference genome, and more.