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The sequence diversity of the Bacillus thurinigiensis flagellin (H antigen [Hag]) protein is analyzed and compared with H serotype diversity along with other Bacillus ceres sensu lato species and strains. The amplification, cloning and determination of the nucleotide sequences of the flagellin allels from B. thuringiensis H serotypes and from B. thuringiensis-related species was reported in the Bacillus cereus senso lacto group.

The sequence diversity of flagellins among serovars from the same H serotypes and the hag genes in Bacillus thuringiensis strains are analyzed. The studies have shown that most clusters contained strains and serovars from the same H serotypes, whereas clusters VII and VIII contained serovars from different H serotypes.