Vascular endothelial growth factor C is required for sprouting of the first lymphatic vessels from embryonic veins Karkkainen, M.J.; Haiko, P.; Sainio, K.; Partanen, J.; Taipale, J.; Petrova, T.V.; Jeltsch, M.; Jackson, D.G.; Talikka, M.; Rauvala, H.; Betsholtz, C.; Alitalo, K. , Nat Immunol, Volume 5, Issue 1, Molecular/Cancer Biology Laboratory and Ludwig Institute for Cancer Research, Haartman Institute and Helsinki University Hospital, Biomedicum Helsinki, University of Helsinki, PO Box 63, 00014 Helsinki, Finland, p.74-80, (2004) Abstract