In Circulation

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They are small, just 22 nucleotides or so in length, but they may have a big role to play in diagnosing and determining the course of various cancers.

Many researchers had long thought that microRNAs played a role in cancer development and progression. But in 2008, some noticed that miRNAs could be detected in the blood, possibly paving the way for their use as cancer biomarkers.

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An Australian study of personalized medicine has run into problems as it recruits patients.

In Science this week: mtDNA analysis give glimpse into decline of Neanderthals in Europe, and more.

The University of Arizona's Raina Maier writes that an understanding of the Earth's microbiome is needed.

The proposed Canadian budget emphasizes partnerships with industry, Nature News reports.