1. Department of Immunology and Key Laboratory for Experimental Teratology of the Chinese Ministry of Education, School of Basic Medical Science, Shandong University, Jinan, Shandong, China.
2. State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong, China.
3. Department of Cell Biology, School of Basic Medical Science, Shandong University, Jinan, Shandong, China.