Nucleotide Sequencing
Double stramded DNA templates for nucleotide sequencing were prepared by CsCl purification. Fragments of DNAs for sequencing were obtained by usimg exonuclease deletion metnod and nucleotide sequences were determined by the dideoxy chain termination method (Sanger et al., 1977) by taqdye-primer sequencing kits (Perkin Elmer Cetus). The fluorescent-dye ladeled DNA fragmrnts were analysed by using an automated DNA sequncer, ABI model 373A.Sequences were further analysed and connected