The invention provides the dapE gene of Helicobacter pylori and H. pylori dapE mutants and to methods of using the mutants to express foreign genes and immunize against foreign agents. The dapE gene can consist of the nucleotide sequence defined in SEQ ID NO:3. Nucleic acids of the gidA gene and ORF...http://www.google.es/patents/US6570004?utm_source=gb-gplus-sharePatente US6570004 - dapE gene on Helicobacter pylori and dapE
