Human Molecular Genetics, 17; 10, 1482–1496 (2008) doi:10.1093/hmg/ddn037

The authors would like to apologize for an error in Figure 5A. Figure 5A erroneously showed the result of a co-immunoprecipitation assay using COS-7 cells, not HeLa cells. The corrected Figure 5A is reproduced here. This error does not affect the conclusions of the article.