This Week in PNAS

Researchers from China and the US report on efforts to sequence fetal DNA circulating in maternal blood samples using Ion Proton semiconductor sequencing. The team used the semiconductor sequencing approach to do retrospective karyotyping on samples from 515 pregnant women, identifying known cases of fetal trisomies 21, 18, and 13 with sensitivities and specificities of more than 99 percent.

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A research duo estimates in PLOS One the number of papers that have used misidentified cell lines.

UK's National Institute for Health and Care Excellence approves GlaxoSmithKline's SCID gene therapy despite cost.

Science reports that Brazilian researchers are petitioning for the reversal of budget cuts.

In PLOS this week: gene flow patterns in common ash, guidelines for using morpholinos in zebrafish, and more.