1. Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, USA
2. Biotechnology Research Center, Southwest University, Beibei, Chongqing, PR China
3. Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, College of Medicine, Gainesville, FL 32610, USA
4. Genetic Engineering Research Center, Chongqing University, School of Life Sciences, Chongqing 40045, PR China