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Transmission electron micrographs illustrating normal septum formation in S. cerevisiae (strain CM1069-40) during cell division. Yeast were inoculated and grown without drug as described in the legend for Fig. 3. After the progression from a mother cell with a small bud to a mother cell with a bud of the same size, a constriction forms at the mother-bud neck prior to septum formation and cell division. Magnifications were as follows: A, ×24.75K; B, ×36K.
