Biological functions of genes differentially expressed in CD16+ and CD16- monocytes. Differentially expressed genes were classified based on their biological functions using Gene Ontology as indicated. Heat maps were generated using dChip software and include data from matched CD16+ and CD16- Mo from 4 different individuals. In each heat map, upregulated genes are plotted first followed by downregulated genes. Red and green signify increased and decreased gene expression, respectively.