Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, USA. pierre.nicolas@jouy.inra.fr|Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, USA. pierre.nicolas@jouy.inra.fr|Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, USA. pierre.nicolas@jouy.inra.fr