Horizontal Gene Transfer Contributed to the Evolution of Extracellular Surface Structures: The Freshwater Polyp Hydra Is Covered by a Complex Fibrous Cuticle Containing Glycosaminoglycans and Proteins of the PPOD and SWT (Sweet Tooth) Families

• Angelika Böttger ,

  * E-mail: boettger@zi.biologie.uni-muenchen.de

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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• Andrew C. Doxey,

  Affiliation Department of Biology, University of Waterloo, Waterloo, Ontario, Canada

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• Michael W. Hess,

  Affiliation Division of Histology and Embryology, Innsbruck Medical University, Innsbruck, Austria

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• Kristian Pfaller,

  Affiliation Division of Histology and Embryology, Innsbruck Medical University, Innsbruck, Austria

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• Willi Salvenmoser,

  Affiliation Institute of Zoology and Center for Molecular Biosciences Innsbruck, Innsbruck University, Innsbruck, Austria

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• Rainer Deutzmann,

  Affiliation Department of Biology, University Regensburg, Regensburg, Germany

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• Andreas Geissner,

  Current address: Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Berlin, Germany

  Affiliation Department of Biology, University Regensburg, Regensburg, Germany

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• Barbara Pauly,

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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• Johannes Altstätter,

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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• Sandra Münder,

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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• Astrid Heim,

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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• Hans-Joachim Gabius,

  Affiliation Institute for Physiological Chemistry, Faculty of Veterinary Medicine, Ludwig-Maximilians-University, Munich, Germany

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• Brendan J. McConkey,

  Affiliation Department of Biology, University of Waterloo, Waterloo, Ontario, Canada

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• Charles N. David

  Affiliation Department Biologie II, Ludwig-Maximilians-University, Munich, Germany

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