In the online data supplement and on page 3852 in the May 1, 2007, issue, there were errors in several figures.
In online Figures S1 and S7, the authors spliced lanes without indicating that they had done so. Figures S1 and S7 and the figure legends were corrected in the online version. The corrected supplemental figures now show with vertical lines the positions at which extraneous lanes from the blot were digitally excised.
Figure 2 contains lane duplications in the Bcl-2 Western blot. The entire experiment was repeated because the primary data from this experiment were not sufficiently documented to allow reconstruction of the figure. The corrected Figure 2 and figure legend are shown.