1. Institute of Biophysics; Academy of Sciences of the Czech Republic, v. v. i, Laboratory of Molecular Epigenetics; Královopolská 135, Brno 61265 Czech Republic
2. University of Florida; Department of Botany; Gainesville, Florida 32611 U.S.A
3. University of London; School of Biological Sciences; Queen Mary E1 4NS U.K
4. Florida Museum of Natural History; , University of Florida; Gainesville, Florida 32611 U.S.A.