VOLUME 276 (2001) PAGES 20436–20443
This article has been withdrawn by the authors. Errors were identified in several figures. Evaluation by the Journal with image analysis software determined that images were reused to represent different experimental conditions in the β-catenin immunoblot in Fig. 2, the β-catenin immunoblots in Fig. 5, the E-cadherin immunoblot in Fig. 6A, the Tcf-4 immunoblot in Fig. 6B, and the β-catenin immunoblot in Fig. 7B. The raw data are no longer available to validate the information. The authors have expressed the opinion that none of these errors affect the final conclusions of this article that, according to them, have been extensively validated during these 15 years.