title: Correction.
abstract: In the article by Dunoyer et al. (2002), Figures 2, 3 and 6 contain northern or western blot images comprising spliced lanes that were not indicated in the original Figures, and in agreement with the editors, we have decided to replace these figures with updated versions in which the spliced lanes are now clearly indicated by white vertical bars. While correcting these figures, it was found that one panel of Figure 2c was also incorrect and this has been replaced with the correct panel. The corresponding figure legends have also been modified to acknowledge these changes.