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Growth (open symbols) and IAA produced (closed symbols) by E. cloacae UW5 (squares), E. cloacae J35 (circles), and E. cloacae J3 (triangles) in the absence (A) or presence (B) of 200 μg of l-tryptophan/ml over 44 h. The data points represent the average from three independent colonies of each strain. Error bars indicate the standard errors of the mean.
