The toxicity of carbon nanotubes is the subject of ongoing debate. A preliminary study using a small number of mice shows that they may be safe, but the results should be treated with caution.
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Zhao, Y., Xing, G. & Chai, Z. Are carbon nanotubes safe?. Nature Nanotech 3, 191–192 (2008). https://doi.org/10.1038/nnano.2008.77
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DOI: https://doi.org/10.1038/nnano.2008.77
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