Figure 4: Negative staining with CD117, CD45, S100, PanCK, HMB45, and desmin in tumor cells (×100). (a) Negative staining with CD117. (b) Negative staining with CD45. (c) Negative staining with S100. (d) Negative staining with PanCK. (e) Negative staining with HMB45. (f) Negative staining with desmin