By Turna Ray

Following the accelerated approval of Vectibix in the US in 2006, follow-on studies have failed to show that metastatic colorectal cancer patients on the drug live longer than those receiving standard chemotherapies. However, Amgen this week said it is in the process of conducting a study to try to prove that Vectibix-treated chemorefractory patients whose tumors express the wild-type KRAS gene do survive longer than patients receiving just chemotherapy.

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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.