1 Centre for Cell Biology and Cutaneous Research, Blizard Institute, The Faculty of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom.
2 Department of Dermatology & Cutaneous Biology, Thomas Jefferson University, 233 South Tenth Street BLSB 406, Philadelphia, Pennsylvania, USA.
3 Centre for Cell Biology and Cutaneous Research, Blizard Institute, The Faculty of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom. Electronic address: d.blaydon@qmul.ac.uk.