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Nature 447, 518 (31 May 2007) | doi:10.1038/447518b; Published online 30 May 2007

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Complex set of RNAs found in simple green algae

Lucy Odling-Smee

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Single-celled organisms aren't as basic as they seem.

A class of RNA molecule, called a microRNA, has been found in a unicellular green alga. The discovery, made independently by two labs, dismantles the popular theory that the regulatory role of microRNAs in gene expression is tied to the evolution of multicellularity.

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