Direct specification of lymphatic endothelium from mesenchymal progenitors by Lupu, I, Grainger, DE, Kirschnick, N, Weischer, S, Zhao, E, Martinez-Corral, I, Schoofs, H, Vanhollebeke, M, Jones, G, Godwin, J, Forrow, A, Lahmann, I, Riley, PR, Zobel, T, Alitalo, K, Mäkinen, T, Kiefer, F, Stone, OA