Fig. 1.

Microscopic images of the LU-HNSCC-26 cell line. a. The cell line was grown until approximately 50% confluent and the photograph taken with a 10× objective. b. The cell line was grown as xenograft in nude mice. The section was stained with hematoxylin and eosin and the photograph taken with a 20× objective. c. The original tumor stained with hematoxylin and eosin. d. Xenograft stained for p16 protein. e. The original tumor stained for p16 protein