1. Jacob, F. and Monod, J. (1961) J. Mol. Biol., 3, 318.
2. Miller, J. H. and Reznikoff, W. S. (1978) The Operon, Cold Spring Harbor Laboratory, New York.
3. Reznikoff, W. S. (1984) in The Microbe (part II) (eds D. P. Kelly and N. G. Carr), Cambridge University Press, Cambridge, p. 195.
4. Gilbert, W. and Müller-Hill, B. (1966) Proc. Natl. Acad. Sci. USA, 56, 1891.
5. Riggs, A. D. and Bourgeois, S. (1968) J. Mol. Biol., 34, 361.