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.
Histologic subtypes (hematoxylin and eosin-stain; original magnification, ×200: A–D). (A) Keratinizing subtype with layered keratin. (B) Keratinizing subtype with cytoplasmic keratinization. (C) Non-keratinizing subtype. (D) Basaloid subtype.
