 The division of labour among Bacillus velizensis SQR9 cells is governed by a policing system that ensures the optimal production of public goods and the elimination of cheaters from the population. The policing system consists of two components, the SpO0A regulatory protein and the Acetyl-CoA carboxylase enzyme. SpO0A triggers the production of malonyl-CoA, which is necessary for the production of bacteria-killing toxins called basillanoic acids. Additionally, SpO0A activates the Acetyl-CoA carboxylase enzyme, which is responsible for producing proteases and ciderophores, thus improving the populations over all health and fitness. This article was authored by Rome Huang, JeHuei Shao, JeHuei Shu, and others.