“…GRNs commonly serve as "decision switches" , turning synthesis of particular proteins 1A gene is defined as a DNA sequence encoding a single protein or a defined set of related proteins. 7 on or off in response to changing environment conditions (see, for example, the lac operon in Section 2.1.5 and the GAL regulon in Chapter 3). GRNs are also involved in internal cell functions, including regulation of the cell cycle and tumor suppression (see [6,7,8,9,10] and Section 2.1.6).…”