Tiny pieces of RNA are turning out to play a big role in health. Over the past few years, scientists have found that these molecules, called microRNAs, are involved in key functions in cells and are linked to the development of certain cancers and other diseases. A new study led by scientists at Nanjing University, in China, finds that microRNAs circulating in blood can serve as a molecular “fingerprint” for cancers and diabetes. The findings raise the possibility that a simple blood test could help clinicians tailor treatments to individual patients.
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