The above article from EMBO Reports, published online on 2 May 2008, has been retracted by agreement between the authors, the journal Chief Editor, and the Head of Scientific Publications, EMBO. The authors' statement follows.
A number of image aberrations in this paper were brought to our attention. Following our own investigation and an institutional investigation by the University of Tokyo, we have concluded that the following issues necessitate retraction of the paper:
Fig 2B: One panel has been duplicated and one panel contains no data.
Supplementary Fig 2E: In two panels, bands are inserted.
The experiments and figure preparations were done in the nuclear signalling laboratory in the IMCB. Since these facts have undermined the integrity of the presented findings, we wish to retract this paper and deeply regret that these misleading data were published and the resulting negative impact on the scientific community.