Figure 1. circKIF4A is upregulated in papillary thyroid cancer with circular characteristics. (A) circKIF4A expression in adjacent normal tissues and papillary thyroid cancer. (B) The relative expression of circKIF4A in cell lines. (C) RNase R assay examined the circular structure of circKIF4A in TPC-1 cell line. (D) Circular transcripts of KIF4A (circKIF4A) was more stable than its linear mRNA transcripts determined by actinomycin D treated assay.