This Week in Nature

There's a slew of papers in the early online edition of Nature on stem cells. "Five studies show that disabling p53, an essential tumour-suppressor protein, improves the efficiency of stem-cell production," says a News and Views authored in part by Scott Lowe. "Are these results a 'heads up' that cancer cells and stem cells are disturbingly similar?"

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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.