Institute of Enzymology Biological Research Center, Hungarian Academy of Sciences, PO Box 7, Budapest, H-1518, Hungary.|Institute of Enzymology Biological Research Center, Hungarian Academy of Sciences, PO Box 7, Budapest, H-1518, Hungary.|Institute of Enzymology Biological Research Center, Hungarian Academy of Sciences, PO Box 7, Budapest, H-1518, Hungary.|Institute of Enzymology Biological Research Center, Hungarian Academy of Sciences, PO Box 7, Budapest, H-1518, Hungary.