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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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A new Trump executive order about "free inquiry" on college campuses may threaten $35 billion-worth of federal research funding, reports Ars Technica.

As we enter conference season, Nature News asks why graduate students and postdocs are sometimes forced to choose between paying the rent and paying to attend important meetings.

A new analysis says that a 2018 study claiming to show biparental mtDNA inheritance has several flaws.

In PNAS this week: a genome sequence analysis of Crucihimalaya himalaica, multicellularity and fruiting body development in mushroom-forming fungi, and more.