Affiliation: | (1) Institute of General Microbiology, University of Bern, Baltzer-Strasse 4, CH-3012 Bern, Switzerland;(2) School of Biological Sciences, University of Sussex, BNI 9QG Brighton, UK;(3) Centro di Ricerche, SCLAVO, 1 Via Fiorentina, I-53100 Siena, Italy |