Table 2.

Correlation matrix of seven modules (labelled by colour) of highly co-expressed genes that have been identified by unsupervised hierarchical clustering on the basis of topological overlap

Module colour	Number of genes	Module preservation (Zsummary)	Module Gene Ontology	Bonferoni (p)
Black	788	10	Intracellular transport	5.20E-11
Blue	1143	50	Skin development	1.10E-17
Brown	384	16	Cell cycle process	7.20E-06
Cyan	271	29	Nucleotide metabolic process	6.50E-06
Grey	745	13	DNA metabolic process	4.50E-15
Light green	467	39	Antigen processing and presentation	1.20E-06
Pink	202	23	Extracellular matrix organization	2.70E-34

The Zsummary is a composite statistic of density and connectivity preservation for the module: < 2, no preservation; 2–10, weak to moderate preservation; > 10, strong evidence of preservation.