Retraction to: Oncogene (2004) 23, 6000–6005; doi:10.1038/sj.onc.1207786; Published online 21 June 2004

This paper is retracted due to the following image manipulations: Figure 1b (pasting of the lanes), Figure 2 (pasting and insertion of the lanes) and Figure 3a (pasting of the lanes). All authors of this paper agree to this retraction.