Cleavage furrow

The same proteins responsible for muscle contraction, actin and myosin, begin the process of forming the cleavage furrow, creating an actomyosin ring.

During the final phase of mitosis, telophase, the furrow forms an intercellular bridge using mitotic spindle fibers.

Phosphatidylethanolamine has been shown to be present during this time, which indicates that it may play a role in movement between the plasma membrane and contractile ring.

The breakage is formed by microtubules and the resealing is negated by calcium dependent exocytosis using Golgi vesicles.

Both require vesicular secretions by the Golgi apparatus for resealing and formation of the cytoskeletal network, in addition to microtubules and microfilaments for division and movement.

In this electron micrograph of a cell, the cleavage furrow has nearly completely divided the cell.
Cilliate undergoing the last processes of binary fission, with the cleavage furrow being clearly visible.