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VEGF is involved in GDNF-induced angiogenesis. (A, B) HUVECs were treated with conditioned medium (CM) from U251 cells transfected with si-Con or si-GDNF. Antibody against VEGF was used to neutralize it in the CM. Transwell migration assay and tube formation assay were performed. ** P<0.01 vs. si-Con group, ## P<0.01 vs. si-Con + IgG group.
