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Preparation and application of polysaccharide composite materials and classification of microneedles. (A) schematic diagram of an amorphous hydrogel structure made by CMC, SA, and EGF [79]. (B) preparation and application of MCS microspheres in wound healing [81]. (C) schematic diagram of the preparation of SA/PEO nanofiber membranes [4]. (D) classification of microneedles [82].
