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2. Clewell, D.B. (1999). Sex pheromone systems in enterococci, pp. 47–65. In: Dunny, G.M., Winans, S.C. (eds.), Cell-Cell Signaling in Bacteria. Washington, DC: ASM Press.
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4. Kado, C.I. (1998). Origin and evolution of plasmids. Antonie van Leeuwenhoek 73:117–126. (Includes a good discussion of the Ti plasmid.)
5. Lazdunski, C.J., Bouveret, E., Rigal, A., Journet, L., Lloubès, R., Bénédetti (1998). Colicin import into Escherichia coli cells. Journal of Bacteriology 180: 4993–5002.