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Downregulated expression of circ_103809 inhibits tumor formation in vivo. (A) After tumor extraction, tumor volume was calculated, respectively and made into a graph. (B) The relative expression of circ_103809 in tumors were examined by qRT-PCR. Data are presented as the mean ± SD of three independent experiments. *P<0.05; **P<0.01; ***P<0.001.
