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Using a technique called TraDIS, for transposon directed insertion-site sequencing, scientists at the Wellcome Trust Sanger Institute led work that mapped 370,000 unique transposon insertion sites to the Salmonella enterica serovar Typhi chromosome. The density and resolution -- "an average of one every 13 base pairs," they say -- has allowed them to assay genome-wide for "essential genes" and create a list of candidates.

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Science reports that a new White House Office of Management and Budget memo rescinds previous ones that helped research institutions deal with pandemic-related closures.

Researchers report on a concerning strain of the H1N1 swine flu virus found among pigs in China, Agence France Presse reports.

The Associated Press reports that US officials are considering allowing pooled COVID-19 testing.

In Genome Research this week: Y chromosome gene expression analysis, de novo mutations rise with paternal age in rhesus macaques, and more.