D. Representative flow cytometry plots revealing the effects of prostaglandin E2 (PGE2) and EP1-4 antagonists on mouse bone marrow monocyte dendritic cell (DC)/macrophage differentiation (n = 3). E. The frequencies of F4/80+CD11C− macrophages and F4/80−CD11C+ DCs under varying treatments as analyzed by flow cytometry analysis (n = 3). 