Tiny 'living' particles may just be lumps of limestone.
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Martel, J. & Young, J. D.-E. Proc. Natl Acad. Sci. USA 105, 5549-5554 (2008).
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Hopkin, M. Nanobacteria theory takes a hit. Nature (2008). https://doi.org/10.1038/news.2008.762