1. Institute of Cell Biology, College of Life Sciences; Zhejiang University; Hangzhou 310058 People's Republic of China
2. Departmant of biology; Ningde Normal University; Ningde Fujian 352101 People's Republic of China
3. Institute of Medical Materials, College of Material and Chemistry; Zhejiang University; Hangzhou Zhejiang 310028 People's Republic of China
4. Laboratory of Bone Marrow; First Hospital, Zhejiang University; Hangzhou Zhejiang 310006 People's Republic of China
5. Institute of Orthopaedics, Second Hospital; Zhejiang University; Hangzhou Zhejiang 310009 People's Republic of China