Table 1. Functional Enrichment of Modules.

Module ID	Subrole	Percentage in Module	Ratio*	Subsystem	Percentage in Module	Ratio*
1	Purine metabolism	3.72	4.24	Pyruvate dehydrogenase	1.86	14.86
	Ribosomal proteins: synthesis and modification	18.14	8.16	Ribosome large subunit	10.70	10.68
				Ribosome small subunit	7.44	11.32
				RNA polymerase RpoABCEZ	1.86	11.88
2	Polysaccharide and lipopolysaccharide metabolism	6.74	5.98	Lipopolysaccharide biosynthesis	1.12	11.96
				Polysaccharide biosynthesis	8.43	7.92
5	Cations and iron carrying compounds	31.43	12.24	Iron (III) transport system AfuABC	5.71	60.84
	Biosynthesis of siderophore group	14.29	57.04	Iron uptake FhuBCD2	5.71	60.84
				Iron uptake FhuBCD3	11.43	73.01
6				CO2 fixation	18.52	53.77
				NAD(P)H:quinone oxidoreductase	11.11	14.79
				NADH dehydrogenase I	3.70	118.30
	Cations and iron carrying compounds	33.33	12.98	Sodium:hydrogen antiport Mrp	29.63	118.30
7	Porphyrin and chlorophyll metabolism	8.16	5.79	Photosystem I main subunits	8.16	43.46
	Photosynthesis	30.61	16.57	Photosystem I other common subunits	6.12	48.89
				Photosystem II main subunits	6.12	21.73
				Photosystem II other common subunits	4.08	10.03
				Phycobilisome	2.04	32.59
	Photosynthesis – antenna proteins	14.29	19.01	Phycocyanin biosynthesis	8.16	37.25
15	Toxin-antitoxin systems	6.93	2.35	Toxin-antitoxin system 16	0.87	13.83
	Restriction-modification systems	3.90	5.41	Toxin-antitoxin system 18	0.87	13.83
				Toxin-antitoxin system 8	0.87	13.83
				Type II restriction-modification systems	0.87	9.22
				Type III restriction-modification system pAQ5	0.87	13.83
				Type IV restriction system LlaI	0.87	13.83

*Ratio refers to the percentage of genes in a given category in the module/the percentage of genes in the same category in the genome as a whole.