This Week in PNAS

In the PNAS Early Edition this week, Jeremy Miller, Steve Horvath, and Daniel Geschwind at the University of California, Los Angeles, report their systems-biology approach, "using weighted gene coexpression network analysis on more than 1,000 microarrays from the brain," to characterize gene expression divergence between mice and humans.

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A new study in JAMA finds that genetic tests might not be able to determine what diet is right for someone seeking to lose weight.

A genome-wide association study that linked common genetic variants to salivary gland carcinoma risk has been retracted, according to Retraction Watch.

Vampire bats' ability to live off blood is etched in their genomes and gut microbiomes, the Scientist reports.

In Genome Biology this week: peopling of the Sahara, epigenetic reprogramming analysis of liverwort, and more.