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CircGFRA1 is upregulated in HER‐2‐positive BC cells and tissues. (A) The circGFRA1 content in HER‐2‐positive BC cell lines. (B) The circGFRA1 expression level in 50 pairs of HER‐2‐positive BC tissues and paired non‐malignant tissues. (C) RNase R degradation assay was employed to verify the circular nature of circGFRA1 in SKBR3 cell line. (D) Actinomycin D assays of the stability of the circular circGFRA1, as well as linear GFRA1 transcripts in SW620 cells
