RNA from unstimulated and IFN-γ + LPS or IL-4-treated Pec macrophages, prepared as described (10), were amplified according to Illumina TotalPrep RNA Amplification Kit protocol (Illumina). MouseWG-6 v2 arrays (Illumina) were employed for direct hybridization, according to the manufacturer’s instructions. The raw data were exported using GenomeStudio software (Illumina) and processed further in Bioconductor. The Minimum Information about a Microarray Experiment compliant microarray data have been deposited in the European Bioinformatics Institute ArrayExpress database (accession number: E-MTAB-6416). Probes with a detection p-value lower than 0.05 in at least one sample in a given group were filtered out.