At 7 and 15 days post-embolization, the rabbits were sacrificed, and the infarcted tissues containing embolic MS were resected and fixed in 4% paraformaldehyde for 48 h prior to evaluation by histopathological analysis. Thereafter, the central auricular artery and the surrounding tissue were dissected, embedded in paraffin, and then cut into 5 μm thick cross-sections. The sections were further stained with hematoxylin-eosin (H&E) and Masson's trichrome, and examined under an optical microscope. After 15 days, the morphological and ultrastructural changes in the vascular endothelial cells in different treated groups were investigated via FETEM. The details are presented in the Supporting Information.

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