Affiliation: | 1. Laboratoire de Biologie Microbienne, Université de Lausanne, CH-1015, Lausanne-Dorigny, Switzerland 2. Laboratory for Molecular Biology, INTRON, CH-8722, Kaltbrunn, Switzerland 3. Fondazione “Istituto Pasteur-Fondazione Cenci Bolognetti”, Istituto di Microbiologia, Università di Roma “La Sapienza”, I-00185, Rome, Italy
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