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How cellular checkpoints couple the orderly assembly of macromolecular machines with cell-cycle progression is poorly understood. The alpha-proteobacterium Caulobacter crescentus assembles a single polar flagellum during each cell cycle. We discovered that the expression of multiple flagellin transcripts is licensed by a translational checkpoint responsive to a dual input signal a secretion-competent hook-basal-body (HB structure and a surge in the FlaF secretion chaperone during cytokinesis, instructed by the cell-cycle program. We f
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