894064.fig.002a
(a)
894064.fig.002b
(b)
894064.fig.002c
(c)
Figure 2: ALDH1 expression in HNSCC tissues: (a) nonmetastatic primary tumor with negative ALDH1 expression, (b) metastatic primary tumor with positive ALDH1 expression, and (c) corresponding lymph node metastases. (Magnification: 400x).