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MSC-Exo treatment upregulated proteins associated with HUVEC proliferation, migration, and angiogenesis. Expression levels of cell cycle-, migration-, and angiogenesis- regulating proteins detected by western blot (a). GAPDH was used to normalize protein levels. b Quantification of Cyclin A2, Cyclin D1, VEGFA, and CXCL12 protein levels compared to the levels in the control group (mean ± SD; n = 3). **P < 0.01, ***P < 0.001 vs. control group
