EXPERIMENTAL FIGURE 17-35 Fluorescent antibodies reveal the localization of myosin I and myosin II during cytokinesis. (a) Diagram of a cell going through cytokinesis, showing the mitotic spindle (microtubules green, chromosomes blue) and the contractile ring with actin filaments (red). (b) Fluorescence micrograph of a Dictyostelium amoeba expressing GFP-myosin-II reveals myosin-II enrichment in the cleavage furrow cortex, as the cell pinches into two during cytokinesis.

[Part (b) courtesy of Douglas N. Robinson]