Putting Together the Puzzle of Simple Gene Regulation: The lac Operon: The discovery of an inducible switch in Escherichia coli that controlled lactose metabolism offered the first clues into gene expression.

The article offers information on the discovery and ongoing research into the lac operon in "Escherichia coli", which was pivotal in understanding gene regulation. Topics discussed include the identification of the lac operon and its components; the regulatory mechanisms involving repressor proteins and inducers like allolactose; and the application of lac operon principles in biotechnology for controlling gene expression.