Effects of FGF10 on the outgrowth of newborn vessels. (A) Control; (B) low concentration FGF10 in culture media; (C) high concentration FGF10 in culture media; (D) low concentration FGF10 plus SU5402 in culture media. Insets in A, B, C and D Show Tie-1 expression in CAM vessels. Scale bars represent 50μm.