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Categories of circular RNAs (circRNAs). A, Classification of circRNAs based on their compositions: Exonic circRNAs (ecircRNAs), circular intronic RNAs (ciRNAs), and exon‐intronic circRNAs (EIciRNAs). B, Classification of circRNAs based on their positions and their adjacent mRNAs: ecircRNAs, ciRNAs, antisense circRNAs, sense overlapping circRNAs, and intergenic circRNAs. C, Coding circRNAs may have at least one internal ribosome entry site (IRES) and have an open reading frame (ORF)
