Affiliation: | a Department of Laboratory Medicine, Karolinska Institutet, Retzius väg 8, SE-171 77 Stockholm, Sweden b Max-Planck-Institut für Biologie des Alterns, Gleueler Str. 50a, D-50931 Cologne, Germany c Department of Biochemistry and Cell Biology, University of Gothenburg, P.O. Box 440, SE-405 30 Gothenburg, Sweden d Department of Biology, University of Padova, Via Ugo Bassi 58B, I-35127 Padova, Italy |