Table 2.

Statistics of datasets used in this study. The first column is the name of the organism, the second column – the number of protein-coding genes in its genome, N_genes, the third column – the number of proteins for which we found at least one paralogous partner, the fourth column is the percentage of proteins with at least one paralog, the fifth column – the total number of distinct BLAST hits generated before we applied subsequent filtering, the sixth column – the number of paralogous pairs included in N_a(p), and the seventh column – in N_d(p).

Organism	Proteome size	Number of proteins with paralogs	% of proteins with paralogs	BLASTP hits	Number of pairs in Na(p)	Number of pairs in Nd(p)
H. pylori	1590	230	14%	3228	260	148
E. coli	4288	1428	33%	16768	2614	1013
S. cerevisiae	5885	1689	29%	43915	2297	1025
C. elegans	19099	6894	36%	204398	46463	5545
D. melanogaster	14015	4153	30%	557047	17621	3238
H. sapiens	25319	9252	37%	1330721	31078	6595