Comparison of gene expression levels and H3K4me3, AcH3 and H3K27me3 modifications among functional gene groups in monocytes, macrophages and DCs. Histone modifications and their correlation with expression levels among (A) individual genes of cell markers and (B) genes involved in antigen presentation and phagocytosis. (C) Functional gene groups of antigen presention and phagocytosis according to their expression levels and histone modification status in three cell populations. Color scale indicates expression level from no expression (blue) to high expression (red). Dark green represents the presence and light green the absence of the modification.