1. Cell and Molecular Biology Laboratory; Center for Nuclear Energy in Agriculture CENA; University of São Paulo USP; Avenida Centenário 303 13400-970 Piracicaba SP Brazil
2. Department of Microbial Ecology; Netherlands Institute of Ecology NIOO-KNAW; Droevendaalsesteeg 10 6708 PB Wageningen The Netherlands
3. Department of Microbiology and Immunology; Rega Institute KU Leuven; Herestraat 49 3000 Leuven Belgium
4. Institute of Biology; Leiden University; Sylviusweg 72 2300 RA Leiden The Netherlands