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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In Science this week: swapping yeast genes with human orthologs to study conservation of function, and more.

Hong Kong is using DNA phenotyping to shame litterers.

A study appearing in Cell suggests some metastatic castration-resistant prostate cancer patients could benefit from PARP inhibitor therapy.

NIH's Francis Collins writes that scientific advances are poised to help populations all over the world, but more scientists are needed to keep the momentum.