Stimulation of corneal angiogenesis. HGF (B), VEGF-A (C), FGF-2 (D), or PDGF-BB (E) was implanted into the micropocket of the mouse cornea. At day 5 after implantation, corneal neovascularization was photographed and measured as vessel length (F), clock hour (G), and vascularization area (H). Corneas implanted with phosphate-buffered saline were used as negative controls (A, F-H). Six to 10 corneas were used in each group. Error bars indicate SEM.