At the end of telophase, the future daughter cells are still connected by a narrow cytoplasmic bridge until cell division is completed. The middle of such a bridge consists of a bundle of microtubules that are remnants of polar microtubules from the mitotic spindle. Dark material (approximately in the middle of the cytoplasmic bridge) comprises actin filaments of the contractile ring. It rests uncertain why the actin contractile ring (and thereby the cleavage furrow) is found exactly in the equatorial plane. It is a curious fact that constriction of the contractile ring is upregulated by myosin II protein activity like in a smooth muscle cell contraction. Follicular epithelial cells of ovaries divide frequently, so they provide for intensive protein synthesis in the intervals between cell divisions to compensate their weight losses. In particular, this is evidenced by a large number of polysomes in the cytosol #1, #2 and by the presence of some fragments of rough endoplasmic reticulum #1, #2 even in a dividing cell. As the follicle matures, there is accumulation of proteins, glycosaminoglycans, and water in the intercellular space.