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Modification and preparation of hyaluronic acid. (A) Esterification. (B) Hydrophobic modification. (C) Graft modification. (D) Acylhydrazine cross-linking. (E) Photopolymerization.
PLA-NHS = polylactic acid-N-hydroxysuccinimide; HA-PLA = hyaluronic acid-polylactic acid; DMSO = dimethyl sulfoxide.
