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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/).
(A) Phases of liquid crystal systems adapted from [120]. (B) Loading models of Q2 and H2 drug delivery systems adapted from [120]. (C) Schematic model of hydrogel adapted from [129]. (D) Hydrogel delivers bioactive molecules and is integrative in treating effects.