1. Living Systems Institute, Department of Biosciences, University of Exeter, Stocker Road, Exeter, EX4 4QD, U.K.
2. Living Systems Institute, Department of Physics, University of Exeter, Stocker Road, Exeter, EX4 6QD, U.K.
3. CPI, Darlington, DL1 1GL, U.K.
4. Applied Photophysics Ltd, Leatherhead, KT227BA, U.K.
5. Analytical Sciences, Biopharmaceutical Development, BioPharmaceuticals R&D, AstraZeneca, Milstein Building, Granta Park, Cambridge, CB21 6GH, U.K.
6. Alan Turing Institute, British Library, London, NW1 2DB, U.K.