1. TEDA Institute of Biological Sciences and Biotechnology Nankai University Tianjin 300457 China
2. Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education Nankai University Tianjin 300457 China
3. Tianjin Research Center for Functional Genomics and Biochips, TEDA College Nankai University Tianjin 300457 China
4. Tianjin Key Laboratory of Microbial Functional Genomics, TEDA College Nankai University Tianjin 300457 China