Pregnant mice treated 70-nm silica nanoparticles or 35-nm titanium dioxide nanoparticles suffer damage to the placenta and fetus, whereas larger nanoparticles do not have an adverse impact.
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Keelan, J. Nanoparticles versus the placenta. Nature Nanotech 6, 263–264 (2011). https://doi.org/10.1038/nnano.2011.65
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DOI: https://doi.org/10.1038/nnano.2011.65