Cytokinesis is the last step of cell division during which the contents of a cell are divided between two daughter cells. This process requires exact positioning of a cytokinetic apparatus, as well as precise timing of its assembly and contraction. Failure to correctly execute cytokinesis can lead to the formation of polyploidal cells, which can contribute to the development of pathologies, such as cancer. During my Ph.D., I studied assembly and contraction of the cytokinetic apparatus in zebrafish.