Most chemicals were obtained from commercial sources. The sources for some of the fine chemicals used in this study are given below. Most of the chemicals such as amino acids, antibiotics, sugars, IPTG, ONPG and X-gal were obtained from Sigma Chemical Co. The media components for the growth of bacteria were routinely from Himedia. The materials used in the recombinant DNA experiments such as restriction endonucleases, T4 DNA ligase, DNA polymerases for PCR amplification and DNA size markers were obtained from companies including New England Biolabs and Fermentas. Quiagen or HiPura Kits used for plasmid isolation, purification of DNA fragments. The oligonucleotide primers used in this study were mainly synthesized on order by Ocimum Biosolutions or MWG Biotech Pvt. Ltd

Inoue buffer

Aprotinin

Stripping buffer