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a) PEI‐g‐PEG/mRNA nanoparticles with various PEG terminal groups and PEG grafting ratios deliver mRNA to pulmonary immune cells. Adapted with permission.[ 28 ] Copyright 2020, American Chemical Society. b) Fine‐tuning of PBAE‐derived polymers with hydrophobic side chain and end‐cap allows for systemic mRNA delivery to the lung and the liver. Adapted with permission.[ 48a ] Copyright 2022, American Association for the Advancement of Science (AAAS).
