From giant viruses to unexplained marine DNA, there may be more to the tree of life than the three domains currently defined.
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Gwyneth Dickey Zakaib writes for Nature from Washington DC.
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Dickey Zakaib, G. The challenge of microbial diversity: Out on a limb. Nature 476, 20–21 (2011). https://doi.org/10.1038/476020a
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DOI: https://doi.org/10.1038/476020a