Calcium and phosphate ions secreted in the intestine form nanoparticles that protect and shuttle protein antigens from the lumen to immune cells in the intestinal wall lining.
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Söderholm, J. Nanoparticles ferry gut antigens. Nature Nanotech 10, 298–299 (2015). https://doi.org/10.1038/nnano.2015.58
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DOI: https://doi.org/10.1038/nnano.2015.58