In an animal cell, cytokinesis pinches the cell in two along a structure called the:

1. A contractile ring composed of actin filaments forms just inside the plasma membrane at the former metaphase plate. 2. As the ring tightens it draws the surface inward. 3. This fissure, or crack, is called the cleavage furrow. 4. Plant cells cannot pinch because of the cell wall, so they build a cell plate instead. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 10 'Cell Reproduction', sections 10.1-10.5_