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Flagellar rotation profiles of Aer mutants. UU1250 strains carrying plasmids with the indicated Aer mutations were analyzed by cell tethering as detailed in Materials and Methods. The histograms show the percentages of rotating cells assigned to each of five behavioral categories, from exclusively CCW to exclusively CW, during the observation period. The shading of the data bars denotes colony phenotype in soft agar assays: white, null mutants; gray, fuzzy mutants; and black, wild type.
