Hematoxylin and eosin staining of lung adenocarcinoma (a) and mucoepidermoid carcinoma (c) sections. Note: malignant cells exhibiting a moderate degree of cell pleomorphism and high mitotic activity index, respectively. (b) and (d) represent tissue detection of C2 antigen. Note the moderate reactivity of ior C5 Mab mainly located in cell secretion and cell clusters, respectively. White bar = 100 μm.