NEW YORK (GenomeWeb News) – The human gut is teeming with microorganisms. By some estimates, it is made up of between 10 trillion and 100 trillion microorganisms, including more than 1,000 bacterial species, the vast majority of which belong to either the Firmicutes or the Bacteroidetes phyla.

While the Human Microbiome Project surveyed microbial residents of a number of body sites, coming up with a reference set of microbial genomes, its initial focus was on the healthy microbiome.

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In PNAS this week: ancestry and admixture in Brazilians, characterization of novel double-stranded RNA mycovirus, and more.

Researchers report that what scents someone picks up can reflect their complement of immune genes.

The New York Times examines ethics and China's push to lead biomedical research.

At her blog, Sally Rockey dives into National Institutes of Health funding data.