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Bacterial flagellation and cell division

The peritrichous flagella of Salmonella are synthesized and function through many cell generations. There are two different aspects in the relationship between flagellar biogenesis and cell division. Filament growth is independent from the cell cycle and the length of filaments appear to be locally controlled at each flagellar base, whereas the number of filaments (or flagellar basal bodies) is dependent on cell cycle. We present a model to explain how the number of filaments is maintained through generations. We will also introduce a new direction for research that might directly connect flagellation and cell division; the global communication between flagellar genes and external factors of a complex regulatory network in a cell.