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Bead assay (1.0-μm-diameter bead) and tethered cell rotation experiments with wild-type strain JY26 (ΔfliC) (black), ΔyhjH mutant strain (gray), and ΔyhjH ΔycgR double-mutant strain (white). The number of motors were 28, 33, 29, 49, 55, and 33, respectively.
