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Flow cytometry analysis of VEGFR1 and VEGFR2 in EC only cultures (A,B) and co-cultures with HBMSCs (C,D). A, C: Percentage of PE positive ECs, B,D: number of receptors per cell as calculated by the use of PE beads. Error bars=s.d., significance ⁎p<0.05, ⁎⁎p<0.01, ⁎⁎⁎p<0.001.
