Published in: Cell Res 2004; 14:303–14.

Due to some concern regarding the scientific overlap between the papers that we published in Cell Research (Cell Res 2004; 14:303–14.) and the paper that we published in the Nucleic Acids Research (Nucleic Acids Res 2004; 32:2231–40.), we hereby retract the paper that we published in Cell Research, even though the data in the Cell Research paper is scientifically valid. We apologize for any inconvenience that this may have caused.