1. Méthodes et Algorithmes pour la Bioinformatique (MAB) team, Université Montpellier 2, L.I.R.M.M. - C.N.R.S., 161 rue Ada, 34095 Montpellier Cedex 5, France
2. Systematics and Evolutionary Biology, Institute for Biology and Environmental Sciences (IBU), Carl von Ossietzky University Oldenburg, Carl von Ossietzky Str. 9–11, Postbox 2503, 26111 Oldenburg, Germany
3. Biomathematics Research Centre, Department of Mathematics and Statistics, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand