PreproTech, Inc. (Rocky Hill, NJ), respectively. Antibodies used include
anti-VEGFR-3, anti-p-Tyr, anti-GAPDH, and anti-p-ERK1/2 (Santa Cruz
Biotechnology, Santa Cruz, CA); anti-p-Akt (Ser-473), anti-VEGFR-2 (55B11),
anti-p-VEGFR-2 (Tyr1175), anti-ERK1/2 (9102), and anti-Akt (4685) (Cell
Signaling Technology, Beverly, MA); anti-PI3K p85 (Upstate Biotechnology,
Waltham, MA), anti-Robo1 (ab7279), and anti-Robo4 (ab10547) (Abcam Inc.,
Cambridge, MA).