- A new approach for containment of microorganisms: dual control of streptavidin expression by antisense RNA and the T7 transcription system. Szafranski, P., Mello, C.M., Sano, T., Smith, C.L., Kaplan, D.L., Cantor, C.R. Proc. Natl. Acad. Sci. U.S.A. (1997)