Angiopoietin-2 is required for postnatal angiogenesis and lymphatic patterning, and only the latter role is rescued by Angiopoietin-1. by Gale, N, Thurston, G, Hackett, S, Renard, R, Wang, Q, McClain, J, Martin, C, Witte, C, Witte, M, Jackson, D, Suri, C, Campochiaro, P, Wiegand, S, Yancopoulos, G