Original Figure legend: <i>"A time series of ratio images of a wild type GFP-myosin-II expressing cell going through cytokinesis. The numbers indicate seconds with 0 defined as the point of nuclear division. Bar, 5 μm."</i>  From the numbers and images it follows that with "nuclear division" the onset of Anaphase is meant. The Organism is <a href="//commons.wikimedia.org/wiki/Dictyostelium_discoideum" title="Dictyostelium discoideum">Dictyostelium discoideum</a>. Cell division is similar for animal cells.
Robinson  et al.
CC BY 2.0
Douglas N Robinson, Guy Cavet, Hans M Warrick and James A Spudich: Quantitation of the distribution and flux of myosin-II during cytokinesis. BMC Cell Biology 2002 3:4   <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1186%2F1471-2121-3-4">10.1186/1471-2121-3-4</a>. Part of Figure 2.