S. N. Chatfield, I. G. Charles, A. J. Makoff, M. D. Oxer, G. Dougan, D. Pickard, D. Slater & N. F. Fairweather
Use of the nirB Promoter to Direct the Stable Expression of Heterologous Antigens in Salmonella Oral Vaccine Strains: Development of a Single–Dose Oral Tetanus Vaccine
Nature Biotechnology 10, 888 - 892 (1992)
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http://dx.doi.org/10.1038/nbt0892-888