Vascular endothelial growth factor B, a novel growth factor for endothelial cells - Olofsson, B; Pajusola, K; Kaipainen, A; von Euler, G; Joukov, V; Saksela, O; Orpana, A; Pettersson, RF; Alitalo, K; Eriksson, U (Proc Natl Acad Sci USA, 1996)