- Identification of the Escherichia coli cell division gene sep and organization of the cell division-cell envelope genes in the sep-mur-ftsA-envA cluster as determined with specialized transducing lambda bacteriophages. Fletcher, G., Irwin, C.A., Henson, J.M., Fillingim, C., Malone, M.M., Walker, J.R. J. Bacteriol. (1978)