Rosetta Genomics last week reported a drop in its first-quarter loss as it trimmed business costs and research and development spending.

For the three-month period ended March 30, the company's net loss fell to $1.7 million, or $0.07 per share, from a year-ago loss of $3.7 million, or $0.23 per share.

R&D expenses in the quarter shrank to $1 million from $1.6 million in the same period a year earlier, while marketing and business costs dropped to $625,000 from $1.2 million.

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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.