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Difference in tumor invasion and metastasis. (A) The representative pulmonary metastatic nodules (arrows, original magnification, ×400). (B) The difference in lung metastasis (P < 0.05). (C) The penetrated cells (original magnification, ×200) treated by resection mice serum (left) was higher than that of control (right), bar, 50 μm. (D) The difference in invasiveness (P < 0.05). The bars indicate the means ± SD.
