1. School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi-221005, India
2. Centre of Microbial and Plant Genetics, Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium
3. Departments of Microbiology and Immunology, and Cell and Tissue Biology, University of California, San Francisco, CA 94158-2517, USA