Jozef Nosek PhD, DSc is an Associate Professor at the Department of Biochemistry, Faculty of Natural Sciences at Comenius University in Bratislava, Slovakia. His research interests include biology and evolution of telomeres, replication of linear mitochondrial genomes and function of their terminal structures, biogenesis of organelles, and morphogenesis of eukaryotic cells. Lubomir Tomaska, PhD, DSc, is an Associate Professor at the Department of Genetics, Faculty of Natural Sciences at Comenius University in Bratislava, Slovakia. He is interested in nucleo-protein structure of nuclear and mitochondrial telomeres, evolutionary pathways leading to different means of telomere maintenance, mitochondrial morphogenesis and inheritance and interplay between the compartments of eukaryotic cells.