Department of Biochemistry and Molecular Biology, Faculty of Medicine, Medical and Health Science Center, University of Debrecen, POB 6, H-4012 Debrecen, Hungary. tozser@med.unideb.hu.|Department of Biochemistry and Molecular Biology, Faculty of Medicine, Medical and Health Science Center, University of Debrecen, POB 6, H-4012 Debrecen, Hungary. tozser@med.unideb.hu.|Department of Biochemistry and Molecular Biology, Faculty of Medicine, Medical and Health Science Center, University of Debrecen, POB 6, H-4012 Debrecen, Hungary. tozser@med.unideb.hu.|Department of Biochemistry and Molecular Biology, Faculty of Medicine, Medical and Health Science Center, University of Debrecen, POB 6, H-4012 Debrecen, Hungary. tozser@med.unideb.hu.