1. Central Sericultural Research and Training Institute, Central Silk board, Berhampore 742 101, India
2. Present address: Regional Muga Research Station, Central Silk Board, Boko 781 123, Assam, India
3. Centre for Cellular and Molecular Biology, Hyderabad 500 007, India
4. Department of Molecular Biology and Biotechnology, University of Kalyani, Kalyani 741235, Nadia, India