1. Bachmann B. Personal communication.
2. Bachmann B. J. 1987. Derivations and genotypes of some mutant derivatives of Escherichia coli K-12 p. 1190-1219. In F. C. Neidhardt J. L. Ingraham K. B. Low B. Magasanik M. Schaechter and H. E. Umbarger (ed.) Escherichia coli and Salmonella typhimurium: cellular and molecular biology. American Society for Microbiology Washington D.C.
3. Berget P. Personal communication.
4. Bio-Rad Laboratories. CHEF-DRII instruction manual appendix. Bio-Rad Laboratories Richmond Calif.
5. Bouche J. S. Bejar and K. Cam. 1990. Cooption of prophage genes: new data on the Kim prophage region of the Escherichia coli chromosome p. 373-378. In K. Drlica and M. Riley (ed.) The bacterial chromosome. American Society for Microbiology Washington D.C.