This Week in Nature

In this week's Nature, a team led by University of Geneva scientists report new insights on Down's syndrome based on an analysis of a pair of identical twins in which only one twin had an extra copy of chromosome 21. While it had been thought that most traits associated with Down's syndrome are caused by altered gene expression from the additional chromosome, the researchers show that differential gene expression is organized in domains along all chromosomes.

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360Dx reports that the US Centers for Medicare & Medicaid Services would cover next-generation sequencing-based cancer panel tests.

The Washington Post reports that a meteorologist is being considered as presidential science and technology advisor.

In PNAS this week: precision medicine strategy to screen for disease risk, genome evolution in Haemophilus influenzae, and more.

Researchers have developed a PCR-based assay to gauge whether manatees are present in waters.