Margaret Hamburg, Stephen Ostroff 

After serving as US Food and Drug Administration Commissioner for nearly six years, Margaret Hamburg is stepping step down from the post at the end of March. 

Stephen Ostroff will serve as acting commissioner afterHamburg's departure. Ostroff most recently served as the agency's chief scientist. 

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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.