The data consists of an object lac_operon_net of the class BooleanNetwork (from the BoolNet package), describing the lac operon gene regulatory network with 10 genes and 3 inputs. The three inputs collectively indicate the concentration of glucose and lactose. Based on the synchronous update scheme, when extracellular glucose is available, the lac operon is OFF (having one steady-state attractor where all genes are OFF). Otherwise, depending on the extracellular lactose concentration, the operon will be OFF, bistable (having two attractors), or ON (all genes are ON).