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Schematic representation of the different types of liposomal drug delivery systems: (A) conventional liposome; (B) PEGylated liposome; (C) ligand-targeted liposome; (D) theranostic liposome (reprinted from Frontiers in Pharmacology, 6, article 286, 1–12. Advances and Challenges of Liposome Assisted Drug Delivery, by Sercombe et al. [87], with permission from the authors).
