Schematic representation of the expression of host and reporter genes. (a) Expression of the gene fis, involving transcription, translation, and growth dilution and degradation of the gene products. (b) Expression of the gfp reporter gene, involving in addition to panel a a folding reaction. (c) Expression of the lux operon encoding luciferase and the enzymes producing the substrate of the luciferase-catalyzed reaction. The latter enzymes are not explicitly shown in the figure. The kinetic constants refer to equations (4)-(8).