1 The Department of Biomedicine, University of Bergen, Jonas Lies Vei 91, N-5009, Bergen, Norway. donald.gullberg@uib.no.
2 Institute of Bioscience and Applications Athens, Greece, National Center for Scientific Research "Demokritos", Aghia Paraskevi, Greece. dkletsas@bio.demokritos.gr.
3 Biochemistry and Molecular Medicine, University of Oulo, Oulo, Finland. taina.pihlajaniemi@oulu.fi.