1. Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene RegulationSun Yat-sen Memorial HospitalSun Yat-sen University Guangzhou 510120 P. R. China
2. RNA Biomedical InstituteSun Yat-sen Memorial HospitalSun Yat-sen University Guangzhou 510120 P. R. China
3. The First Affiliated HospitalSun Yat-sen University Guangzhou 510006 P. R. China
4. Center for NanomedicineBrigham and Women's HospitalHarvard Medical School Boston MA 02115 USA
5. School of Biomedical EngineeringSun Yat-sen University Guangzhou 510006 P. R. China