This Week in PNAS

In work published in the early online edition of PNAS this week, scientists study how evolutionary selection affects modes of gene regulation. Using a model that takes into account genetic drift, mutation, and time-dependent selection, they found the "effective population size and the typical time scale of environmental variations to be key parameters determining the fitness advantage of the different modes of regulation," they say in the abstract.

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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.