Table 3.

DNA Backbones Statistics

	All	Chromosome	pSymB	pSymA
Number of chains	1,035	349	118	60
Total length (Mb)	2.68	2.03	0.51	0.27
Length proportiona	Nd	0.54	0.31	0.18
Average length (bp)	5,391.9	5,819.7	4,342.4	4,502.2
Standard size (bp)	6,561.6	6,281.8	6,257.8	5,522.5

Note.—Nd, not determined.

^aReplicon size is the average replicon length in the four complete Sinorhizobium meliloti genomes.