Table 2.

Assortativity coefficients for the networks considered in this study

Organism	Nodes (proteins)	Fractions of edges of different types			Total edges	Assortativity (r)
		EE	NE	NN
Arabidopsis thaliana	7,090	0.002	0.066	0.932	69,603	0.034
Caenorhabditis elegans	5,184	0.005	0.100	0.895	46,737	0.041
Helicobacter pylori	1,352	0.105	0.390	0.505	7,915	0.071
Streptococcus pneumoniae	1,718	0.019	0.171	0.810	8,597	0.084
Mycoplasma genitalium	446	0.825	0.158	0.017	3,376	0.088
Haemophilus influenzae	1,497	0.249	0.454	0.296	8,877	0.090
Salmonella typhimurium	3,712	0.020	0.145	0.836	20,985	0.135
Saccharomyces cerevisiae	5,477	0.193	0.371	0.436	105,429	0.212
Pseudomonas aeruginosa	4,556	0.047	0.168	0.785	21,818	0.265
Mycobacterium tuberculosis	3,295	0.141	0.294	0.565	18,445	0.284
Escherichia coli	3,789	0.149	0.261	0.590	25,784	0.352
Bacillus subtilis	3,347	0.068	0.159	0.773	20,728	0.367
Mycoplasma pulmonis	616	0.658	0.216	0.126	3,111	0.397
Vibrio cholerae	2,958	0.176	0.251	0.573	15,644	0.404
Streptococcus sanguinis	1,801	0.184	0.252	0.565	8,315	0.411
Staphylococcus aureus subsp. aureus N315	1,966	0.235	0.274	0.491	9,207	0.413
Acinetobacter baylyi	2,546	0.263	0.278	0.459	12,996	0.422
Francisella novicida	1,415	0.360	0.287	0.353	7,587	0.426
Staphylococcus aureus NCTC	2,127	0.245	0.238	0.517	9,500	0.486
Salmonella enterica serovar typhi	3,491	0.137	0.149	0.714	19,650	0.554

EE Essential–Essential, NE Non-essential–Essential, NN Non-essential–Non-essential

The table lists the different organisms along with the fraction of different types of edges and the assortativity coefficient, computed as indicated in the text. The list is sorted in increasing order of the assortativity coefficient (r)