Immunohistochemistry in representative Merkel cell carcinoma tumors with good and poor prognoses. (a) intermediate KRT20 staining in poor prognosis tumor. (b) Weak KIF3A staining in poor prognosis tumor. (c) Weak punctate KRT20 staining in good prognosis tumor. (d) Negative (absent) KIF3A staining in good prognosis tumor. All images were taken at 10X magnification with Nikon digital DS-Fi1 high definition color camera on the Nikon Eclipse 90i. Scale bar = 50 μm.
