1. Cobra Biologics, Stephenson Building, The Science Park, Keele ST5 5SP, UK
2. School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
3. Institute of Microbiology & Infection, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
4. School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK