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the clone libraries, participated in the sequence analysis and drafted the manuscript. JH participated in the sequence analysis, did the community comparison analysis and drafted the manuscript. LP participated in the design of the study and helped with sequencing. PA participated in the design of the study and helped draft the manuscript. MR designed the study and helped draft the manuscript. All authors read and approved the final manuscript.”
“Background Several genera of soil bacteria can enter into nitrogen-fixing symbioses with leguminous plants. These genera, commonly referred to as the ‘rhizobia’, include Sinorhizobium, Rhizobium, Bradyrhizobium, and Azorhizobium. Formation of specialized, microaerophilic nodules on the roots of the host plant are elicited by the bacteria. Following infection and colonization of the nodule tissue, the bacteria undergo differentiation into a mature state known as the bacteroid, which can reduce atmospheric dinitrogen to ammonia. Bacteroid metabolism is dominated by the production of fixed nitrogen, which is transferred directly to the host plant.

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