Representative immunohistochemical and immunoblotting analysis of anaphase-promoting complex (APC)7 in invasive ductal carcinomas of the breast. (A) Invasive ductal carcinomas stained by APC7 antibody with intensity scores of 0 to 3+ (original magnification, ×400). After binding with anti-mouse APC7 antibodies as primary antibodies and with biotinylated anti-rabbit antibodies as secondary antibodies, streptavidin peroxidase was bound to the biotinylated antibodies. Staining was conducted with 3-amino-9-ethylcarazole and hematoxylin. (B) Immunoblotting of three breast tissues with APC7 intensities ranging from 0 to 3+. Immunoblotting was carried out using affinity-purified APC7 antibodies and peroxidase-conjugated anti-rabbit IgG antibodies as primary and secondary antibodies, respectively. Electrogenerated chemiluminescence was used to detect positive bands. (C) Representative negative (panel a) and positive (panel b) APC7 immunostaining of invasive ductal breast carcinoma with histologic grades of 3 and 2, and staining intensities of 0 and 3+, respectively. Immunohistochemical staining was also performed using a streptavidin peroxidase kit.