This Week in PNAS

Researchers from the US and the UK used a molecular clock modeling method to take a look at the H1N1 influenza A virus behind the 1918 pandemic, using full length sequence data for influenza A viruses from a range of subtypes and host preferences. The team did molecular clock analyses on each influenza A gene using a few hundred sequences apiece, generating data that puts the emergence of the 1918 pandemic flu virus sometime prior to 1907 or so.

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Polygamy amplified a rare genetic disease in area near Arizona-Utah border, BBC Future reports.

Genetic ancestry testing led one woman to learn that her father and another baby boy had been switched at birth, the Washington Post reports.

Simple de-identification methods can protect information in a database from attackers, a new study suggests.

In Science this week: approach to visualize chromatin structure in nuclei, and more.