P Avner, T Bruls, I Poras, L Eley, S Gas, P Ruiz, M V Wiles, R Sousa-Nunes, R Kettleborough, A Rana, J Morrisette, L Bentley, M Goldsworthy, A Haynes, E Herbert, L Southam, H Lehrach, J Weissenbach, G Manenti, P Rodriguez-Tome, R Beddington, S Dunwoodie & R D Cox Nature Genet. 29, 194–200 (2001).

An error was introduced while preparing the paper for press. It occurs in the list of author affiliations on page 194. The correct affiliation Patricia Ruiz is “4Centre de Recherche du CHUL, Ste-Foy, Quebec, Canada.” rather than “6, Ste-Foy, Quebec, Canada”.