1. Université Paul-Sabatier, Centre de Recherche sur la Cognition Animale, UMR CNRS 5169, 118 route de Narbonne, 31062 Toulouse cedex 9, France
2. Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10C, DK8000 Aarhus - C, Denmark