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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The US Supreme Court has declined to review a decision involving the use of "inadvertently shed" DNA in a police investigation and subsequent conviction.

A panel at the New York Times discusses anonymity and privacy of users of 23andMe's services when access to its database is offered for research.

National Institutes of Health Director Francis Collins appears before a House subcommittee to discuss his agency's budget request.