1 Department of Molecular Biology, Faculty of Medicine, Umeå University, Umeå, Sweden.
2 Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States.
3 Departament de Bioquímica i Biologia Molecular, Institut de Biotecnologia i de Biomedicina (IBB), Universitat Autònoma de Barcelona, Barcelona, Spain.
4 Department of Biology, Institute of Biochemistry, Zürich, Switzerland.
5 Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, United States.