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Fig. 1. Phase contrast image of confluent cultures (A,B) and electron micrograph images showing cell structure (C,D) of MCF-7 (A,C) and MCF-7B (B,D) cells. TJ, tight junction; AJ, adherens junction; Des, desmosome. (A,B) Magnification, 250x. Scale bars: (C) 0.42 µm; (D), 0.21 µm