Figure 2.

Roles of septation in S. pombe cytokinesis. Top) Primary and secondary septa are formed simultaneously as the contractile ring constricts. Formation of the septum “locks” the ring into place and prevents sliding from the cell middle. Contractile ring constriction (F_{Contractile Ring}) and septum formation (F_Septum) oppose the cell's high turgor pressure (P_Turgor) to constrict the division apparatus. Middle) A contiguous septum is formed and matures after the contractile ring completely constricts. Bottom) Glucanases are secreted to break down the inner primary septum which allows separation of daughter cells. Each new cell end rounds due to internal turgor pressure as separation occurs.