Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg Centre for SystemsBiology, Sandtorstrasse 1, Germany. klamt@mpi-magdeburg.mpg.de|Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg Centre for SystemsBiology, Sandtorstrasse 1, Germany. klamt@mpi-magdeburg.mpg.de|Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg Centre for SystemsBiology, Sandtorstrasse 1, Germany. klamt@mpi-magdeburg.mpg.de