What should a researcher do if he or she finds something unexpected in the DNA of a human research participang during an experiment? That was one topic of the recent Personal Genomes meeting at Cold Spring Harbor Laboratory, says Nature News' Erika Check Hayden. What are the ethics of revealing "nasty surprises" to people, Hayden asks. As sequencing an increasing number of genomes becomes more common, this question will come up more and more, Hayden says.

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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.