[1] Univ Freiburg, IMMH, D-79104 Freiburg, Germany
[2] Univ Freiburg, Res Training Grp Organogenesis GRK1104, D-79104 Freiburg, Germany
[3] Univ Freiburg, Spemann Grad Sch Biol & Med, D-79104 Freiburg, Germany
[4] Vienna Bioctr, Res Inst Mol Pathol, A-1020 Vienna, Austria
[5] Univ Erlangen Nurnberg, D-91054 Erlangen, Germany
[6] Univ Klinikum Erlangen, Inst Med Microbiol Immunol & Hyg, Dept Infect Biol, D-91054 Erlangen, Germany
[7] Univ Freiburg, Med Ctr Freiburg, Dept Internal Med 1, Core Facil Genom, D-79106 Freiburg, Germany
[8] Univ Cambridge, Wellcome Trust Canc Res UK Gurdon Inst, Cambridge CB2 1QN, England
[9] Univ Freiburg, BIOSS Ctr Biol Signalling Studies, D-79104 Freiburg, Germany