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Exosomal miRNA-34 promotes apoptosis of GC cells in vivo. (A) Immunostaining assay for Ki67 in xenograft tumors treated with exosomes loaded with miRNA-34 mimics. (B) Immunostaining assay for cleaved-caspase-3 in xenograft tumors treated with exosomes loaded with miRNA-34 mimics. Values are means ± SD; **, P < 0.01, ***, P < 0.001.
