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Expression levels of microRNAs (miRNAs) in conditioned media from biliary tract cancer (BTC) cell lines. Expression levels of (A) miR‐451a and (B) miR‐3619‐3p in three BTC cell lines (HuCCT‐1, SSP‐25, and TFK‐1) is shown relative to that in a normal bile duct epithelial cell line (MMNK‐1). Data are shown as mean ± SD (n = 4). *p < 0.05; **p < 0.01.
