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MiRNAs suppressed cell metastasis in vivo. (a) An experimental metastasis mouse model was injected with control miR-206, miR-140, or scrambled control oligos-treated A549/34 R cells. (b) Visualization of the HE-stained lung section. Arrow, the migratory A549 cells. (c) Immunohistochemistry was conducted to detect CD44 expression. Brown color indicates the migratory A549 cells. Bar=100 μm
