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Nodulated lateral roots of 25-d-old (A) wild-type and (B and C) na-1 plants. Wild-type nodules are large and display a white meristematic tip and a red center that represents the zone of nitrogen fixation. The few aberrant nodules that do develop on the na-1 mutant are small and white and resemble an emergent nodule meristem that failed to develop further. Bar = 1 cm.
