Abstract
Two highly homologous flagellin genes, flaA and flaB, are expressed in Bacillus thuringiensis subsp. alesti. Both genes were found to be transcribed during vegetative growth. After the onset of sporulation, transcripts could not be detected. Both flaA and flaB were found to be transcribed from sigma70-like promoters. In addition, the 3'-terminal half of flaA was cloned and sequenced, completing the sequence of flaA.