Figure 4 of an article in the September issue should have been published in colour (Fukuzawa R, Heathcott RW, More HE, et al. Sequential WT1 and CTNNB1 mutations and alterations of ß-catenin localisation in intralobar nephrogenic rests and associated Wilms tumours: two case studies. J Clin Pathol 2007;60:1013–16). Figure 4 is published in colour on our website at http://jcp.bmj.com/supplemental.