Immunohistochemical staining of non malignant breast tissue biopsies with anti-NUCKS and anti-ki67 antibody. Tissue sections stained with anti-NUCKS (A-D) and corresponding sections stained with anti-ki67 (E-H) antibody. (A), (E), Normal breast tissue exhibiting negative staining for both NUCKS and Ki67. (B), (F) Fibroadenoma exhibiting negative staining for NUCKS and low staining for Ki67. (C), (G) Sclerosing adenosis exhibiting strong staining for NUCKS and negative staining for Ki67. (D), (H) Strong immunoreaction for NUCKS in ADH and low for Ki67. Scale bar, 50 μm.