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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In a statement, National Institutes of Health Director Francis Collins says sexual harassment is "morally indefensible" and "unacceptable."

Octopuses might owe their intelligence to their liberal alterations to their genes, Cosmos reports.

Stat News and ProPublica report that African Americans are underrepresented in cancer clinical trials.

In Cell this week: genomic analysis of abdominal aortic aneurysm, effect of probiotics on the microbiome, and more.