This Week in Nature

Researchers led by the University of Copenhagen's Eske Willerslev report in Nature that they have sequenced an ancient horse — the oldest creature to be sequenced — along with a number of other, related species. The ancient horse, between 560,000 years and 780,000 years old, was sequenced to 1.12 times using the Illumina and Helicos platforms.

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Two researchers have found that behavioral genetic defenses in criminal cases don't tend to affect outcomes, according to Popular Science.

Researchers report that while host genetics influence the oral microbiome, they don't appear to affect cavity-causing microbes, the Economist says.

Pandas' gut microbiomes change as what they eat changes with the seasons, writes Discover's Inkfish blog.

In PLOS this week: comparative genomic study of malaria-linked macaque parasite, search for apple root reference genes, and more.