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TET inhibits tube formation in HUVECs. The effects of TET on HUVEC differentiation were examined by their in vitro tube formation ability on matrigel. The branch points of the capillary-like tubes were counted under light microscopy (magnification 100x). Each value represents the mean ± S.D. of triplicate samples in each case. **P < 0.01 versus the VEGF-only group.
