Genes expressed in Flk-1-positive endothelial precursors are induced by VEGF-A in HUVECs. Time-course analysis of the human orthologues of the mouse genes as in Figure 3, as indicated. Vertical bars for each transcript, as indicated, measure the fold induction at the time indicated. Induction analysis was performed with RT-PCR and normalized on GAPDH expression. The data shown are the results of 3 independent experiments.