Table 2.

Data sets used to compile the Escherichia coli genome-wide interaction networks

Interaction Type	E. coli K12 MG1655	E. coli B REL606	E. coli K12 MDS42a
Protein–protein	2,737 (Jensen et al. 2009)	2,721 (Jensen et al. 2009)	2,534 (Jensen et al. 2009)
Protein–DNA	4,492 (Salgado et al. 2013)	3,415 (Salgado et al. 2013)	3,890 (Salgado et al. 2013)
Sigma	727 (Salgado et al. 2013)	1,225 (Salgado et al. 2013)	592 (Salgado et al. 2013)
Metabolic	2,798 (Kanehisa et al. 2014)	5,136 (Kanehisa et al. 2014)	2,462 (Kanehisa et al. 2014)
Phosphorylation and dephosphorylation	44 (Kanehisa et al. 2014)	38 (Kanehisa et al. 2014)	40 (Kanehisa et al. 2014)
Srna	213 (Salgado et al. 2013)	2 (Salgado et al. 2013)	171 (Salgado et al. 2013)
Size (edges)	11,011	12,537	9,689
Size (nodes)	2,732	2,650	2,418

^aThe E. coli K12 MDS42 network was derived from the E. coli K12 MG1655 network by deleting all edges connecting genes that do not exist in E. coli K12 MDS42.