Publications mentioned in the Appendix are: Arp2/3 complex activity in filopodia of spreading cells Simon A. Johnston, Jonathan P. Bramble, Chun L. Yeung, Paula M. Mendes and Laura M. Machesky. BMC Cell Biology, 2008, 9, 65 http://eprints.bham.ac.uk/632/ Tuning specific biomolecular interactions using electro-switchable oligopeptide surfaces Chun L. Yeung, Parvez Iqbal, Marzena Allan, Minhaj Lashkor, Jon A. Preece, Paula M. Mendes. Advanced Functional Materials, 2010, 20, 2657-2663.