When does cytoplasm pinch into?

Cytoplasm pinches in during the process of cytokinesis, which occurs at the end of mitosis or meiOSis. This process involves the formation of a cleavage furrow in animal cells, where the contractile ring of actin and myosin filaments constricts the cell membrane, ultimately dividing the cytoplasm into two separate daughter cells. In plant cells, cytokinesis involves the formation of a cell plate that develops into a new cell wall.