Figure 1. Negative control slide that was treated identically with an irrelevant antibody. No labeling was observed (A: original magnification 40×). Immunohistochemical staining for CD34. Blood vessels and stromal cells showed immunoreactivity for CD34 (B: original magnification 40×). Immunohistochemical staining for c-kit. Vascular endothelial cells (C: original magnification 100×) and stromal cells (D: original magnification 40×) showed immunoreactivity for c-kit.