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Fig. 9. HUVEC tube formation assay. HUVECs were transfected with NC, si1 and si3. After 48 hours, cells were trypsinized and resuspended in EBM-2 supplemented with 2% serum, and 4x104 cells were added to each well of a 48-well tissue culture plate with 100 µl solidified growth-factor-reduced Matrigel. Pictures were taken at 24 hours. Representative pictures from five independent experiments are shown. Quantitative data are shown as the mean ± s.e.m. All difference between groups were statistically significant (P<0.05), tested by two tailed Student's t-test.