Affiliation: | (1) Physiologie Microbienne (CNRS URA 1129), Département de Biochimie et Génétique Moléculaire, Institut Pasteur, 28 rue du Dr Roux, 75724 Paris Cedex 15, France;(2) Present address: Department of Microbiology & Immunology, School of Medicine, Emory University, 3001 Rollins Research Center, Atlanta, GA 30322, USA |