In order to better understand the molecular genetics of Bacillus cereus(Bc),a pair of degenerate primers(designated aiiA1/aiiA2),which can amplify the entire coding region of aiiA gene,were designed and used to investigate the existence of aiiA gene in 3 Bc strains by PCR.The results showed that all of them contained the aiiA gene.A novel aiiA was cloned from Bc GP7 by PCR with pMD18-T vector and was sequenced.The nucleotide sequence had been registered in GenBank with accession no.AY943831.It consisted of ...