A, Intravitreal injection of LIF increases blood vessel density in the mouse eyes. Adult mice were intravitreally injected with VEGF (10 ng) or LIF (10 ng to 100 ng, Sigma). Seven days after injection, PFA-fixed choroid-sclera complexes and retina were subjected to CD31 IF. Representative images of CD31-positive vessels are shown in A. Scale bar = 100 µm.Vascular 