[1] European Mol Biol Lab, Dev Biol Unit, Meyerhofstr 1, D-69012 Heidelberg, Germany
[2] Heidelberg Univ, Ctr Organismal Studies, Neuenheimer Feld 230, D-69120 Heidelberg, Germany
[3] Univ Cambridge, Dept Physiol Dev & Neurosci, Anat Bldg,Downing St, Cambridge CB2 3DY, England
[4] Albert Einstein Coll Med, Dominick P Purpura Dept Neurosci, Dept Syst & Computat Biol, 1301 Morris Pk Ave, Bronx, NY 10461 USA
[5] Albert Einstein Coll Med, Dept Pathol, 1301 Morris Pk Ave, Bronx, NY 10461 USA
[6] Santa Fe Inst, 1399 Hyde Pk Rd, Santa Fe, NM 87501 USA
[7] Harvard Med Sch, Howard Hughes Med Inst, Dept Genet, Boston, MA 02115 USA
[8] Harvard Med Sch, Howard Hughes Med Inst, Dept Ophthalmol, Boston, MA 02115 USA
[9] Smithsonian Inst, Dept Paleobiol, MRC 121, POB 37012, Washington, DC 20013 USA
[10] Cincinnati Childrens Hosp Med Ctr, Perinatal Inst, Cincinnati, OH 45229 USA
[11] Sch Nat Sci, Biomed Sci Bldg,Newcastle Rd, Galway, Ireland
[12] Regenerat Med Inst REMEDI, Biomed Sci Bldg,Newcastle Rd, Galway, Ireland
[13] Univ Vienna, Dept Microbial Ecol & Ecosyst Sci, CUBE, Althanstr 14, A-1090 Vienna, Austria
[14] Arizona State Univ, Sch Life Sci, POB 4501, Tempe, AZ 85287 USA
[15] Marine Biol Lab, 7 MBL St, Woods Hole, MA 02543 USA
[16] Yale Univ, Yale Syst Biol Inst, New Haven, CT 06511 USA
[17] Yale Univ, Dept Ecol & Evolutionary Biol, New Haven, CT 06511 USA
[18] Yale Univ, Sch Med, Dept Obstet Gynecol & Reprod Sci, 333 Cedar St, New Haven, CT 06510 USA
[19] Wayne State Univ, Dept Obstet & Gynecol, Detroit, MI 48201 USA