1. College of Biological and Environmental EngineeringChangsha University Changsha 410022 P. R. China
2. Research Center for Marine DrugsState Key Laboratory of Oncogenes and Related GenesDepartment of PharmacyRenji HospitalSchool of MedicineShanghai Jiao Tong University Shanghai 200127 P. R. China
3. Department of Biochemistry and Molecular BiologyCollege of Basic Medical SciencesSecond Military Medical University Shanghai 200433 P. R. China