Corneal angiogenesis is deficient in Cd151-null mice. (A) Five days after implantation of pellets containing 20 ng bFGF, vessels were stained with PE-conjugated anti-CD31. Clock-hour length of sprouting vessels was quantitated (**P < .005). (B) Corneal pellets contained 40 ng bFGF. After 5 days, vessels were stained with anti-CD31, and vascular area was quantitated (*P < .05). Scale bars represent 100 μm in panels A-B.