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Knockdown of circRAD18 suppresses the metastasis of papillary thyroid cancer cells. (A,B) Transwell assays were performed to evaluate cell migration capability in TPC-1 and KAT-5 cell lines. Crystal violet was used to stain migrated cells. (C,D) The migration ability of cells was tested by wound-healing experiments (the magnification: 40×). **, P<0.01.
