When plants genetically engineered to produce bacterial or viral proteins are consumed as food, they trigger a protective immune response in animals and humans.
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Arntzen, C. Pharmaceutical foodstuffs—oral immunization with transgenic plants. Nat Med 4 (Suppl 5), 502–503 (1998). https://doi.org/10.1038/nm0598supp-502
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DOI: https://doi.org/10.1038/nm0598supp-502