1. Editorial

   • Olaf Breidbach
   • Jürgen Jost
   • Michael Weingarten

   EditorialNotes Pages: 1 - 2

2. Evolution of cell division in bacteria

   • J. T. Trevors

   OriginalPaper Pages: 3 - 15

3. Critical periods as fundamental events in life

   • G. Nissim Amzallag

   OriginalPaper Pages: 17 - 32

4. Aggregation of variables and system decomposition: Applications to fitness landscape analysis

   • Max Shpak
   • Peter Stadler
   • Joachim Hermisson

   OriginalPaper Pages: 33 - 68

5. External and internal complexity of complex adaptive systems

   • Jürgen Jost

   OriginalPaper Pages: 69 - 88

6. The duplication of the Hox gene clusters in teleost fishes

   • Sonja J. Prohaska
   • Peter F. Stadler

   OriginalPaper Pages: 89 - 110