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Quantitative capillary chemotaxis assays of P. putida KT2440R toward Casamino Acids (A) (control), NaCl (B) (control), sodium acetate (C), sodium l-lactate (D), sodium pyruvate (E), and sodium propionate (F). Data were corrected with the number of cells that migrated into buffer-containing capillaries. Data are means and standard deviations from at least three independent experiments. *, P < 0.1; **, P < 0.05 (by Student's t test).
