References

• Lodish, Harvey; Baltimore, David; Berk, Arnold; Zipursky, S. Lawrence; Matsudaira, Paul; and Darnell, James; ``Molecular Cell Biology,'' third edition, Scientific American Books, New York, 1995.

• Watson, James D.; Hopkins, Nancy H.; Roberts, Jeffery W.; Steitz, Joan A.; and Weiner, Alan M.; ``Molecular Biology of the Gene,'' fourth edition, Benjamin/Cummings, Menlo Park, 1987.

• Ptashne, Mark, ``A Genetic Switch: Phage $\lambda$ and Higher Organisms,'' second edition, Cell Press, Cambridge, 1992.

• Palmer, Trevor, ``Understanding Enzymes,'' fourth edition, Prentice Hall, Hertfordshire, 1995.