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.
Representative images showing HLA class I expression by rectal cancer cells. A, Grade 0 expression. B, Grade 1 expression. C, Grade 2 expression. D, Grade 3 expression. Magnification, ×200.
