Retardation of retinal vascular development in apelin-deficient mice - Kasai, A; Shintani, N; Kato, H; Matsuda, S; Gomi, F; Haba, R; Hashimoto, H; Kakuda, M; Tano, Y; Baba, A (Arterioscler Thromb Vasc Biol, 2008)