A Chinese research team led by investigators from Sun Yat-Sen University last week reported on the discovery of a single microRNA that, when overexpressed, can boost rice yield by as much as 25 percent.

Because the miRNA — miR-397 — is highly conserved across different grain species, the scientists speculated that its manipulation may also be useful for increasing yield in other crops.

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In PNAS this week: rare variants linked to bleeding disorder, comparison of whole-exome and whole-genome sequencing, and more.

George Church tells The Sunday Times that his group has inserted some woolly mammoth genes into elephant cells.

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