For the differential expression analysis we selected those probes passing the p-value threshold of 0.05 and with a minimum fold change of 1.4 under cell stimulation. Further we focused on those differentially expressed probes with a minimum expression intensity of 500 in a given group so to select for transcripts already expressed also in the unstimulated cells. Genecodis (11) was used for transcription factor (TF) enrichment analysis and selected those terms passing FDR-corrected p-value threshold of 0.05 and containing at least three genes.