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Immunoreactivities of PCNA and CD44 in ASE and CIS. Representative images for immunoreactivities of PCNA and CD44 in cases 1 and 2 of ASE and 21 and 31 of CIS. Top panel, ×100 magnification. Bottom panel, ×400 magnification. Scale bars, 200 µm. PCNA, proliferating cell nuclear antigen; ASE, atypical squamous epithelium; CIS, carcinoma in situ.
