1 Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia. Electronic address: tea.lanisnik-rizner@mf.uni-lj.si.
2 Helmholtz Zentrum München, Institute of Experimental Genetics, Genome Analysis Centre, 85764 Neuherberg, Germany; German Centre for Diabetes Research (DZD), Neuherberg, Germany; Lehrstuhl für Experimentelle Genetik, Technische Universität München, Freising-Weihenstephan, Germany.