基金项目: | Acknowledgements This study was supported by the grants from the Key Tech-nologies R&D Program of Sichuan Province (2008SG0025), the Program for New Century Excellent Talents in University (NCET-04-0861) and Sichuan University Research Grant 985. We thank Dr Yong-sheng LIU for kindly providing the electron microscope, Yong-qiu MAO for providing the flow cytometer and assistance, and Sheng-fu LI for providing K562 cells. |