1. Key Laboratory of Animal Resistance Research, College of Life Science, Shandong Normal University, Jinan, Shandong 250014, P.R. China
2. Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, SE-171 77, Sweden
3. Department of Clinical Laboratory, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong 250117, P.R. China