Immunohistochemistry-Stained Images of DC Clusters. Immunohistochemistry stained images of DC (dendritic cell) clusters from two each healthy, disease-free and relapsed patients. Stains include: Magenta (CD1a, Immature DCs), Brown (CD83, Mature DCs), Blue (Hematoxylin, Non-DC cells). The dark purple cells are pan-cytokeratin-stained tumor cells. Note the increased number and density of DCs in control nodes. All images were taken at 200× resolution.