*To whom correspondence should be addressed. E-mail: firstname.lastname@example.org
¶Dedicated to my colleague and friend Frédérique Messud (1962–2005)
Laboratoire de Microbiologie et Génétique Microbienne, CNRS, Université Paul Sabatier, Toulouse, France
Department of Genetics, Biomolecular Sciences and Biotechnology Institute, University of Groningen, Haren, The Netherlands
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