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The immunogenicity of SF SS and SF-SS hydrogel sponges. (A) Immunofluorescence staining of CD31 in skin wound treated by SF SS and SF-SS hydrogel and UMSC-Exo encapsulated in SF SS and SF-SS hydrogel. SF SS Exo, the Exo was delivered by SF SS composite hydrogel; SF-SS Exo, the Exo was delivered by SF-SS composite hydrogel. (B) Quantification of vessel diameter by Image J. Data is shown as mean ± standard deviation (n = 3). ns, no significant difference, *p < 0.01, ***p < 0.001.
