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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Customized Delivery Systems. Liposomes (left), nanoparticles (center), and exosomes (right) can be tailored to penetrate into the deepest parts of the lung and deliver therapeutics directly to epithelial cells through the mucus layer. Created in BioRender.com.