1 Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Oxford, OX2 6GG, UK. Philip.Maini@maths.ox.ac.uk.
2 Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.
3 Systems Biology Laboratory, Department of Biomedical Engineering, Faculty of Engineering and Information Technology, University of Melbourne, Victoria, 3010, Australia.
4 Systems Biology Laboratory, School of Mathematics and Statistics, University of Melbourne, Victoria, 3010, Australia.
5 Queensland University of Technology, Brisbane, Australia.