University of Bordeaux, CNRS / LaBRI, F-33405, Talence, France. ruricaru@labri.fr.|MIG, UR 1077, INRA, 78026, Jouy-en-Josas cedex, France. celia.michotey@versailles.inra.fr.|MIG, UR 1077, INRA, 78026, Jouy-en-Josas cedex, France. helene.chiapello@toulouse.inra.fr.|LIRMM, UMR 5506, Computational Biology Institute, CNRS, University of Montpellier 2, Montpellier, France. rivals@lirmm.fr.