Four-day differentiated human monocyte-derived macrophages were treated with 100 ng/mL IFN-γ or 10 ng/mL IL-4 singly or in combination for 18 h or 48 h. Extracted RNA samples were subjected to analysis by the Human Epigenetic Chromatin Modification Enzymes RT2 Profiler PCR Array (QIAGEN). p Values were calculated based on full plate normalization with twofold change as a cut off value (hence the blank values) and using a Student’s t-test of the replicate 2(-Delta Ct) values for each gene in the control group and treatment groups.