K5/6 immunohistochemistry using mouse monoclonal K5/6 antibody (1/50, clone D5/16 B4, DAKO) using Tris buffer (pH 9.0) microwave antigen retrieval. Human skin (A), normal ovary (B), benign serous cystadenoma (C), serous borderline tumor (D), serous carcinoma with low K5/6 immunostaining (E) serous carcinoma with high K5/6 immunostaining (F). K5/6 immunostaining in tissues obtained from the same patient at diagnosis (G) and following treatment carboplatin and paclitaxel (H). Scale bar = 100 μm. All images are same magnification.