The Editors-in-Chief would like to alert readers that concerns have been raised regarding this article [1].

It appears that Figure 7 contains multiple duplications. However, it does not affect the main conclusions of the article as to the subcellular location, appearance and interactions of the various proteins analysed.

Richard M Levenson, Daniel L Farkas, Edward V Prochownik and Edwin S Levitan agree to this Editorial Expression of Concern. Xiao-ying Yin, Melanie F Landay, Weiping Han and Simon C Watkins have not responded to any correspondence from the publisher about this Editorial Expression of Concern.

The original article can be found online at https://doi.org/10.1038/sj.onc.1204606