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Paracrine release from PBAE/VEGF-engineered human ADSCs enhanced EC tube formation. (a–d) CM from PBAE/VEGF-transfected ADSCs led to formation of interconnected tubular structures by HUVECs (scale bars=500 μm). (e) The number of branch points formed by HUVECs in response to CM from all groups (*p<0.05 vs. EBM; #p<0.05 compared with Lipo).
