1 Max-Planck-Institute for Evolutionary Biology, Department of Theoretical Biology, August-Thienemann-Str. 2, D-24306 Plön, Germany.
2 The Panda's Thumb (Science Blog: http://www.pandasthumb.org), Holbæk, Denmark.
3 Max-Planck-Institute for Evolutionary Biology, Department of Theoretical Biology, August-Thienemann-Str. 2, D-24306 Plön, Germany; Institute for Biological Physics, University of Cologne, Zülpicher Strasse 77, 50937 Köln, Germany.
4 Westfälische Hochschule Gelsenkirchen / Bocholt / Recklinghausen, Campus Recklinghausen, Dept. of Molecular Biology, Faculty of Engineering and Natural Sciences, August-Schmidt-Ring 10, D-45665 Recklinghausen, Germany. Electronic address: [email protected].