Cell division. Color enhanced micrograph of a human epithelial cell in cytokinesis. Following mitosis, the cells separate by "furrowing" the membrane with an "invisible thread" of actin and myosin, separating the two cells. This is known as cytokinesis. In this image, chromosomes (DNA) are blue, and microtubules appear green. These pancreatic epithelial cells secret bicarbonate, which neutralizes acid and is critical to proper digestion. 5040x at 70 mm.