1. Department of Pathology and Neuroscience Program, Biomedicum Helsinki, P.O. Box 63, Haartmninkatu 8, 00014 University of Helsinki, Helsinki, Finland
2. Muscle Molecular Biology, International Centre for Genetic Engineering and Biotechnology, Padriciano 99, 34012 Trieste, Italy
3. Department of Biology and CRIBI Biotechnology Centre, University of Padova, Via Ugo Bassi 58b, 35131 Padua, Italy
4. Department of Pathology, University of Turku and Turku University Central Hospital, Kiinamyllynkatu 10, 20520 Turku, Finland