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C40-tPEG-Ex4-Cys (PEG-Ex4) enhances tube formation via activating GLP-1R/Akt/VEGF pathway in HUVECs. A and C, Tube formation assay. B, D and E, Western blot analysis of total and phosphorylated Akt and VEGF in HUVECs. **P < 0.01 vs. vehicle; &P < 0.05 vs. Ex4-P1, &&P < 0.01 vs. Ex4-P1.
