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Effects of COX-2 on tumor angiogenesis. The tumor microvessel densities (means) in sections from tumors formed by the vector transfectants SGC7901-V (V) and the siRNA transfectants SGC7901-siRNA (S). Tumor samples were immunostained with antibodies against CD31. Mean ± SD, n = 3. *, P < 0.05 VS. control.
