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Asymmetric cell division during Bacillus subtilis sporulation.

Bacillus subtilis is a rod-shaped bacterium which divides precisely at mid-cell during vegetative growth. Unlike Escherichia coli, another model organism used for studying cell division, B. subtilis can also divide asymmetrically during sporulation, the simplest cell differentiation process. The asymmetrically positioned sporulation septum serves as a morphological foundation for establishing differential gene expression in the smaller forespore and larger mother cell. Both vegetative and sporulation septation events are fine-tuned with cell cycle, and placement of both septa are highly precise. We understand in some detail how this is achieved during vegetative growth but have limited information about how the asymmetric septation site is determined during sporulation.