Illumina this week asked the US Patent and Trademark Office to investigate the validity of a patent owned by Affymetrix's newly integrated ParAllele BioScience unit, claiming that its scientists had originally invented the technology.

The San Diego-based company announced that it had contacted the USPTO on Monday, the same day Affy said it had closed its acquisition of ParAllele for $121 million in stock and cash.

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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.