This Week in Nature

In a paper published online in advance in Nature this week, a team led by researchers at Oregon Health and Science University describes "ploidy conveyor" as a source of genetic variation in hepatocytes. It shows that in mouse polyploidy hepatocytes, multipolar mitotic spindles frequently form — which "can result in one-step ploidy reversal to generate offspring with halved chromosome content," the team writes.

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In Science this week: self-assembly of DNA components in solution, and more.

Genetics and Molecular Research retracts two gastric cancer papers for being "substantially equal" to other papers, according to Retraction Watch.

A new analysis indicates that the Ebola virus behind the current West African outbreak is mutating at about the same rate as other Ebola viruses.

With the launch of Scott Kelly into space today, the study of him and his earthbound brother to disentangle the effects of life in space from the effects of genetics kicks off.