Large-scale genetic variation of the symbiosis-required megaplasmid pSymA revealed by comparative genomic analysis of Sinorhizobium meliloti natural strains

Table 2 Genes variable in each strain compared to strain Rm 1021

Strain	Log2-ratio> 0	Log2-ratio< 0	Total genes variable	Total genes analysed*	% of variable genes
AK58	237	50	287	6192	4.6%
AK83	273	80	353	6199	5.7%
BL225C	379	22	401	6181	6.5%
BO21CC	292	56	348	5670	6.1%

*The total number of genes analysed varies according to the number of spots discarded due to technical defects. The list of variable genes is reported as Additional Material '[see Additional file 1]'.

ISSN: 1471-2164