For example, in the roundworm Caenorhabditis elegans, which feeds on bacteria, serotonin is released as a signal in response to positive events, such as finding a new source of food or in male animals finding a female with which to mate.
Por exemplo, no verme nematodo Caenorhabditis elegans, que se alimenta de bacterias, a serotonina libérase como un sinal en resposta a eventos positivos, por exemplo, atopar unha nova fonte de comida ou nos machos atopar unha femia coa que aparearse.