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Nodulation in ein2 and wild-type plants. (A) Number of nodules per g dry root weight. Values are mean±SE (n=5). ***P<0.001. (B) Photograph of nodules on a secondary root of (left) wild-type and (right) ein2 plants (tertiary roots have been removed) grown under nitrate-free conditions for 28 days. Scale bar=1cm. (This figure is available in colour at JXB online.)
