RETRACTION
Volume 33, no. 9, p. 1768–1781, 2013, https://doi.org/10.1128/MCB.00987-12. Analysis of our data indicated duplicate bands in Fig. 6E and 7A. It is unclear whether the source of these errors was accidental or purposeful. However, these errors did not change the conclusions of the paper. Nonetheless, we thank the journal for recognizing these errors, and we hereby retract the paper.