1 Department of Genetics, Eötvös University, Pázmány P. s. 1C, H-1117 Budapest, 2Department of Medical Chemistry, Semmelweis University, PO Box 260, H-1444 Budapest, 3Statistical and Biological Physics Group of the Hungarian Academy of Sciences, Pázmány P. s. 1A, H-1117 Budapest, 4Morgan Stanley Hungary Analytics Ltd., Lechner Ö. f. 8, H-1095 Budapest and 5Department of Morphology and Physiology, Semmelweis University, Vas u. 17, H-1088 Budapest, Hungary (At 2010-06-11)