Nat. Med. 9, 1267–1268 (2003); published online 07 September 2003; corrected after print 11 October 2011

In the version of this article initially published, there are irregularities with the tubulin loading controls in lanes 1 through 4 and with the KSR1 bands in lanes 7 and 8 of Figure 2f. The authors have repeated the experiment and have provided a new figure panel that is now published as part of the correction notices linked to the HTML version and attached to the PDF version of the article. The original figures remain in both online versions of the article. The authors have also made a correction to Supplementary Figure 6b, which has been added to the supplementary file online. H. Rosie Xing does not agree to this correction.

Figure 1
figure 1

Figure 2f