Researchers from Massachusetts General Hospital and Harvard Medical School have developed a microfluidic device that can be used as an alternative to flow cytometry for measuring T cell counts in people infected with HIV. They hope that the small handheld device will help Africans — it will first be tested in Rwanda — in poor regions to better manage their disease.

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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.