Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Low-power field and b high-power field: H&E staining of the biopsy specimens from the gastric tumor. A dense population of semi-circular cells was observed. Pigmented granules were not observed. Immunohistochemistry: c positivity for S-100 protein; d positivity for Melan A; and e weak positivity for HMB-45
