Abstract
The Sinorhizobium meliloti genome consists of three replicons. This bacterium forms an intricate symbiotic relationship with the roots of certain legumes and is considered as an agriculturally important nitrogen-fixer. A consortium of 6 European laboratories was organized to sequence its single chromosome (3.7 Mb), whereas the other two elements (pSyma 1.4 Mb and pSymb 1.7 Mb) will be sequenced by other groups.
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