Figure 2.

 Immunohistochemical analysis of CYP2A13 in human lung cancer tissues. Adjacent noncancerous (a) bronchus and (b) peripheral lung tissues; (c) adenocarcinoma; (d) squamous cell carcinoma; (e) large cell carcinoma; (f) small cell carcinoma. Strong immunostaining was observed in the epithelial cells in bronchus, but not in peripheral lung tissues. In lung carcinomas, immunostaining was positive in most of non‐small cell carcinomas. In contrast, the staining was mostly negative in small cell carcinoma. Original mag‐nification, ×200.