1. Faculty of Life Sciences, Michael Smith Building, University of Manchester, Oxford Road, Manchester M13 9PT, UK.
2. Wellcome Trust Centre for Cell Matrix Research, University of Manchester, Manchester M13 9PT, UK.
3. The Healing Foundation Centre, University of Manchester, Manchester M13 9PT, UK.
4. University of Hohenheim, Institute of Zoology, Garbenstrasse 30, D-70593 Stuttgart, Germany.