Fig. 2. Electron microscopy of septa in wild-type (YPH499), chs2 (YMS11) and myo1 (YMS57) strains. (A) early invagination in cytokinesis of wild-type; (B) completed primary septum in wild-type; (C) completed trilaminar septum in wild-type; (D) an advancing abnormal septum (right) and a completed septum (left) in the chs2 mutant; (E) a completed septum in the chs2 mutant, showing a lacuna; (F), an advancing abnormal septum in the myo1 strain; (G), an advancing septum (left) and two completed septa in the myo1 mutant. White arrows indicate an advancing primary septum; black arrows point to lacunae. Bars represent 1 µm.