Department of Biological Physics, Eötvös Loránd University and Statistical and Biological Physics Research Group and CellCom RET at the Hungarian Academy of Sciences, Budapest, Hungary.|Department of Biological Physics, Eötvös Loránd University and Statistical and Biological Physics Research Group and CellCom RET at the Hungarian Academy of Sciences, Budapest, Hungary.|Department of Biological Physics, Eötvös Loránd University and Statistical and Biological Physics Research Group and CellCom RET at the Hungarian Academy of Sciences, Budapest, Hungary.