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Root hair morphology on uninoculated and inoculated roots. (A to C) Typical root hairs from zones I, II, and III, respectively, of an uninoculated alfalfa plant. (D) Diagram of an alfalfa seedling, showing the locations of root hair zones I, II, and III. (E to G) Photographs showing how root hair responses to S. meliloti can vary along the length of a single root. The three images were taken from a single inoculated seedling at the locations indicated on the central diagram.
