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Although for many years it was thought that it was unlikely that bacteria communicate with each other by establishing a "social" behavior, numerous studies carried out in the last three decades revealed that bacteria do communicate with each other, and not only that, they can be censored or count. The communication systems that bacteria use for this purpose are called Quorum Sensing systems. In these systems, a decoy molecule known as an autoinducer is regularly used, which is produced individually by each of the cells of the colony. The autoinducer is then transported to the outside of the cell where it progressively accumulates as the number of bacteria in the colony increases. When a high concentration of the autoinducer is reached, it is detected by special receptor molecules, which in turn activate the expression of genes that respond to the cell density of the colony.