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FGF signaling is required for VEGF stimulation of tubulogenesis. sFGFR1-IIIc and sFGFR3-IIIc, as well as FGFR1-DN negate VEGF induction of tube formation. Micrographs (A-C) are confocal images displaying the relatively wide tubes typical of VEGF stimulation. Data are means ± SEM.
