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Immunohistochemistry for TTF-1 and Ki-67 of A549 cells. (A and B) TTF-1 expression in A549 cell: (A) untransfected TTF-1 group showed only cytoplasmic staining and (B) transfected TTF-1 plasmid showed cytoplasmic and nuclear staining (×400). (C and D) Ki-67 expression in A549 cells: (C) transfected TTF-1 plasmid group and (D) transfected blank plasmid group.
