Systems Biology Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany. mirschel@mpi-magdeburg.mpg.de|Systems Biology Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany. mirschel@mpi-magdeburg.mpg.de|Systems Biology Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany. mirschel@mpi-magdeburg.mpg.de|Systems Biology Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany. mirschel@mpi-magdeburg.mpg.de|Systems Biology Group, Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany. mirschel@mpi-magdeburg.mpg.de