1. Distributed Systems Laboratory, Åbo Akademi University and Turku Centre for Computer Science, Finland
2. Computational Biomodeling Laboratory, Åbo Akademi University and Turku Centre for Computer Science, Finland
3. Computational Biomodeling Laboratory, University of Turku and Turku Centre for Computer Science, Finland; National Institute for Research and Development in Biological Sciences, Romania. ion.petre@utu.fi